Auto Switching to Battery Module l UPS for Router l Up-to 9 Hrs Backup l Modem UPS
ฝัง
- เผยแพร่เมื่อ 17 ต.ค. 2021
- Hello Friends,
Welcome Back... In this video, I have made UPS for Router. This UPS will work up to 9 Hrs continuously. No worry about the power cut. Every day I am using it. I am very happy with this UPS. I am using it for Online classes, Work From Home, Ect... Follow the instructions and make it simple.
Note: (Please Be Safe)
* Please be careful with 18650 Batteries. It May Blast/Fire/Harm You.
* Solder the batteries after watching this video fully.
* Ensure you are soldering correctly and don't overheat the batteries while soldering.
* I Don't Have Spot welding so I soldered. - วิทยาศาสตร์และเทคโนโลยี
Thank you.. this what I'm looking for. You save my day 🙂
Excellent and perfect presentation
You need a LI-ION charge controller board placed before the BMS. An economical option is a module board based on the CN3722 chip, which supports an input range between 40 and 12 volts. This way you can use a commercial 24 volt input transformer. The BMS protects the battery against internal overloads and external anomalies, but it alone is not capable of managing the battery charge.
For the step down output module, I would choose a variant with an integrated voltmeter, since it has protection against inverted voltage at both ends.
Grazie anche da parte mia: non ricordavo la sigla dell' IC che credo sia CN3722
So the BCM Balanced 12v, must use the charge adapter lower 12,5v to charge, if higher ( ex: 13v) BCM Balanced will cut-off cause UPS doesn't work?
Bro please make an ups for wifi router with multiple output ports. By the way nice explanation and editing. keep it up bro
C’est excellent pour l’explication 👍✌️👏🏻
As far as I know, this 20A board doesn't have a balancing IC... the 40a and 60a versions already have a balancing IC.
Is it true?
Please tell me if this version 20a board already has a balancing IC
Bro amazing mere nearby ye module easily mil gye and maza a gya bhai 450 rs m bn gya ye to
Внятно и понятно! Так держать!
excellent thanks to you working trick 😊☺️😊 💯💯💯 and success ☺️☺️
Bhai par ak dikat he 3s battery full charge me 1 router 12 v only = 35 minutes backup deta he ab kya karu bhai.... 😔
Good evening, I can use x 4 batteries 2600 mah or more. But charging them with a solar panel?
good idea. ...thank so much
Why do we need a diode right after the 12V input? To prevent ad-dc adapter from being damaged by power from battery? Or when main grid is off to prevent electricity to flow to the adapter and save battery capacity? Thanks!
oneway flow for need diod
mt3608 step up module k sath kitny lithium battery use kr skta hun
Very Nice Sir👌
This might seem like a good idea but in practice there are multiple flaws with this design, first of a BMS isn't supposed to control charging so you risk damaging either the input powersupply or the batteries but connection it straight to the batteries. The batteries will also never be able to reach full charge anyway as they're fully charged at 12.6V which is more than the 12V input not even accounting for the voltage drop across the diode. At best the battery might get charged to 50%. Finally the out put is connected to a step-down module which in all fairness does make sense for the router in the video, but the vast majority of routers are powered by 12V which this setup can't handle and the comments are full of people not realizing this (you'd need a boost converter/step-up regulator for this).
Please do not try this at home, it lacks safety and won't work for most applications there are other resources on how to do this in a much more appropriate way available online.
@@@
can you recommend me a better resource bro? Thanks
Sir, Can you recommend a better design ? it will be good if the circuit if do 5V backup.
Hii kya ham mobile phone k battery use kar sakte hai ?.
nice here my questions why used DC to DC booster as BMS (Powerbank Module) will gives also output current 9V ~ 0.6A
My modem input volt is 9v 1a only. BMS will provide 12V 10A, So I need to ensure that I am giving the correct voltage and ampere to work my modem without any problem. To reduce the volt and the current I am using a DC-DC Buck module (LM2596).
Mr. AK what if I use a 12v fan connector from a computer as the power supply? The wire is 26 gauge and can handle 2 amps. Is that too low for what the 3 18650's will ask for?
Or will it charge safely just very slow?
If you feel like this, just change the wire for a safer side.
Sir 12v battery can charge 12v Router adapter.. Its very ezzz i want to make 1 ups for my router and onu
What should I do, if I want a dual output of 12v - one for router and other for optical fiber switch.
Take two wire from output but increase the battery capacity or number of batteries.
Please make more videos and guide us
thanks for the awesome video bro .. just 1 question on diode .. will the diode get heat up .. could u please check once? is there any alternative for diode?
No, It won't get heat.
What about the voltage drop due to Diod?
Is bms m Charging ho rhi ki nahi y kaise pta chlega ????
Can I leave the power adaptor switched on in the input jack while the ups is in use? Will it overcharge the batteries or will my power consumption goes up?
Yes, you can leave it. BMS will stop the current to the battery once the battery is full. So the current from the power supply will directly go for output. The boost or Buck module will control the output.
I am switching on the AC-DC power supply at 9am and I will switch off it at 9pm only. I will get a continuous connection even power cut.
i am having 12v bike battery then there is no need of use BMS am i right. once the battery is full means the current will automaticaly cutoff and the current flow directly to the wifi router which component will handle this job.
ok
does your setup charge those batteries as they wait to be used as back up if they arent full?
Yes, it will charge the battery.
Sir 12v battery can charge 12v Router adapter.. Its very ezzz i want to make 1 ups for my router and onu
hello sir the content was super helful and amazing keep up the good work, but can i use MOTORCYCLE BATTERY instead of them ?
Thanks, BMS will cut off the power at 4.2v. If the motorcycle battery is equal to 18650 (3.7v). Then you can use it.
Do I need to add a diode in output, which diode should I need to use 4007 or 5048 and I can i use 12v 10amp power supply to charge battery will it be safe
1. For Output - what is the router ampere. If it is 1a or 1.5a, you can use 4007.
2. 10A is not required to charge the battery. 1 or 2 amps is enough.
how mah battery will be used ??
If the bms module output 12v, do I need xl 6009 module to run in ac/dc a 12volt onu
Yes, but ensure you are getting correct ampere in output.
ভাই এটি কি সোলার কন্ট্রোলার দিয়ে সার্চ করা যাবে?
Good
does this setup blip power when it switches or is it completely uninterrupted?
You will get continues power supply.
What is the mah per battery you used and I have used 1n5408 diode is it okay and do I need to add a diode in output.
I am using old laptop batteries and there are no details about the battery capacity so I don't know about mah.
For Input, 1N5408 is ok no issues but for output select as per your modem input current.
Kahan pe milenga mujhko laptop ka battery konsa shop mein mil sakta hai
@@SomnathDas-ej3ve Laptop Service Shop or Buy new batteries online like Makerbazar, HNHCart.
is possible to use 6 battery with same BMS ? 2 grupo of 3 battery on parallel ? to increase autonomy in hours. thanks a lot. I am from chile 👋
Yes you can add more at the same time, it will take more time to change the battery also.
Very nice and helpful project and I am about to do it but I want to ask you. When I plug it into power socket 220V and I have the power on the UPS does it take power from the battery or the socket and if I keep using it like that is there a danger of burning it ? Thanks
That's why we are using BMS. When the battery is full, BMS will stop charging the battery and the current from AC will directly go to the output. No worry everyday I am using it.
@@MrAKsTime you are lying .. their is no bypass line in your circuit.. ( continuously battery will be charging and discharging in your circuit)
@@technicalsohil4063 Once the battery is full, the BMS will stop charging the batteries. So the power supply from the power adaptor will directly go to output (LM2596). In case of power failure, the batteries will continuously supply the power.
@@MrAKsTime ok let me check ✅
@@MrAKsTimewhy you use lm2596.
?
I have question about voltage booster module assume, we gave 11.1v to module and get 12v in output if it suddenly get 12 volt in input then the output voltage remain same to 12volt or increase?
1. If you are using the module in output (LM2596 or XL6009) you will stable power supply as you fixed.
2. If you are using direct output from BMS, then you will get 12v. It won't reduce.
@@MrAKsTimei am talking about bs3 bms Sir aagar isme 24hr charger ka connection lagae rahke to battery kharab to nhi hogi?
@@NikhilKumar-vc1we That's why we are using BMS. It will stop charging the battery when it is full and the current will come as output directly. So Don't worry.
Oh Whaooo it was great product
One more question!
I have 2600Mah 3 battery
I will connect in series to make 11.1v then how much ampere bms i have to use?
@Technical zone BD i have 10amp bsm is it not working,?
Bhai Jan main nay ya circut banyan hai lakin in4007 charging k Dron heet bohat hota hai
I have used buck booster pcb XL 6009. But the BMS output voltage is dropping to 4V when the XL 6009 pcb is connected. What to do ?
please reply
My question, can you put the adapter outlet, so it can run for 24 hours plugged in, battery will not overcharge?
BMS will control it.
Is that need two buck module for 12v and 9v?
For 12v you can use but ensure about output amp. If you need 9v output, use buck module
At a same time in or out use kiya ja sakt hai
Yes...
yx-x801 vs yx-0001 মডিউল গোলোর ভিডিও করেন pls ভাই আমার ব্যাটারি লো ভোল্ট এ কাট আউট করতে চাই এখন কোনটা ব্যাবহার করবো?
Hi, whata the difference between 3s 20A or 3s 10A. How does this matter on BMS
3s 10A will support up-to 10ampere current, same as 20A.
I have one question: so the BMS get 12v input (or 11.4 volt because the diode takes 0.6v) , can the BMS charge 12.6V to the battery?
100% BMS will charge the battery. I am using this module every day since I made it. I will plug in a 12v 1a power adapter every day Morning 9am to 9pm. It will work up to 7 hrs in case of power failure.
@@MrAKsTime thanks! I am going to build the same thing, and I had that question before. I thought I need a voltage DC-DC step up to make it to at least 13V. Another question: can we just plug in the AC power supply non-stop, so we don't need to unplug it when the battery is full? The BMS will regulate the charging, right?
@@gunsts BMS will stop charging once the battery is full. So no issues.
@@MrAKsTime BMS will not charge the battery, it needs 12.6v
@@sergLV remove the diode.
Sir I have a question. Can i take two output of 12 volt from the single LM2596 for my two routers rated 12v 1 amp respectively? Waiting for your answer
Take two output and connect your router with one output and simultaneously check the 2nd output with multimeter first then connect with router.
@@MrAKsTime thankyou. Can I have ur telegram id
@@somdutttah t.me/+9Qk-wttNWlxiMzA1
@@MrAKsTime sir, saying that the link expired
@@somdutttah t.me/+wvGsiBORoHQ2NGE1
Sir , do you better flawless design with lot of improvements?
My router is of 12V. what will happen if dont use the buck booster pcb XL 6009 ?? is it neccessary ? Please reply
Nothing will happen but ensure the output amp.
if you use this setup majority of the time with wall power like a router, theres no issue with overcharging the battery?
BMS will protect the battery. It will stop the power supply once the battery is full.
@@MrAKsTime can i use it on a 24v setup. lets say instead of using 3S bms ill use diffrent bms for example 4s so it will have a long run time
ive seen a lot of videos they use a relay but it still has a flicker of about .33 seconds. so far this is the good built connect the AC to the battery and let the BMS do the work.. no downtime even if AC fluctuates
@@jhazbandola6808, yes, you can. Ensure the output voltage and ampere are correct as per the modem/router input voltage.
@@MrAKsTime how to check amp ?
Can I get two 12v output from this single buck converter? Please reply.
Yes, but the running will get reduced. So you need to increase the battery capacity.
For example 6battery with single buck converter can I get 12v
@@ashiqhussainbaig9801 Yes, you can reduce the voltage to 12v.
If I add 3 more battery and make it parale (to keep voltage at 12v and increase battery cappacity) to extends Router backup time, should I change BMS module? What BMS module type/specification you recommend?
Thanks
This BMS is ok for 12v output. So you can increase the batteries for long runtime.
@@MrAKsTime How much maximum battery cell I can added to this BMS to ensure this module work correctly?
@@ArifinNoviyadi your wish. check in youtube for more details. Many videos are there.
the bms module output is 12v so why you used xl6009 booster module?
I need 9v output, so I am used LM2596 buck module, not xl6009.
isko esa banana hai ki, apan adapter ki male diy ups me inout dekar rakhe aur ups se output wifi router ko. taki jab light jaye to adapter to off ho jayega aur ups apne aap battery mode me ho jayega... ye system karo bhai.... hume khud haatho se on off na karna pade.
English, please...
Please is it available 4v 18650 battery? I got 3.7v only.Thanks & Regards..
Yes, 18650 battery BMS is available for 4v. and you need to use XL6009 to step up the output voltage as per your router.
Want to make 6v 3A dc to dc and connect it with a 3W solar can u show using the circuit which u are using
Mail me with the same comment and I will send you the image. mraktimes@gmail.com
what current is required to charge those 18650s in this BMS
12v
@@MrAKsTime Thank you!!! Awesome content
Where do you buy these components ?? is it from Richie Street ?? and does this work ??
Qartzcomponents.com
makerbazar.com
electronicscomp.com
electronicspices.com
Not sure about Richie street, if you know any shop, then you can buy.
@@MrAKsTime Thanks bro
Is it possible to add more baterries so they provide the 12v needed, perhaps using a different charge controller? Does the booster itself consume any current to work?
If you increase the battery, you will get more backup. you can add and the boost module will not consume much current.
What if you just skip this module and use the battery connected to the power supply. Current will be drown from the power supply, the battery will be fully loaded. When there is the outage battery will be used. Whta is the advantage of this module? Voltage regulator can be used to produce stable 12V. My router works fine for input voltage 9-24 so it has the regulator build-in.
Se colleghi direttamente le batterie al litio ad un alimentatore senza limitazione di corrente oppure di tensione la corrente potrebbe diventare eccessiva e tale da danneggiare le batterie o addirittura farle esplodere.
agree, a cheap power bank could be used to power the router, the problem is they switch off then power consumption is too low
Wouldn't battery will be cahrging and disscharging at the same timer?
yes. BMS will work accordingly.
how can use number of lithium battery in this mt3608 step up module....plz reply
Check this image for your reference www.pinterest.com/pin/142356038212983863/
Salam Sir,
I've watched your video and made same power bank accordingly to the wiring but I'm facing issue.
Router specs : 12V 1Amps
UPS made 12V but I've used XL6009 as i think that it should give constant output voltages even input fluctuates o/p remains same.
Now my issue,
When my power bank is fully discharged and when the power from adopter is again arrived my router doesn't turn on properly as its power led blinks continuously and remain like that (Not turning on my router) until I turn my router off for once and turn it back on. what could be the issue.
One more thing what is the purpose of diode on the output as 1N4007 has a voltage drop of almost 1V which is already drooping on the I/P also while charging the battery and supplying the router at the same time which leads to lower voltages 11v which I think could be issue as there are two loads one is battery that's completely drained out it needs to be charged and the other is router which also need voltages of its requirement ( but that router voltages can be maintained through Step up converter as it will give constant O/P Voltages but not current).
Could it be possible that I try same voltage higher amps adapter so that as it need initial torque when it's charging the battery and the router at the same time as my charger that comes with the router is of 12v & 1Amps it's designed accordingly to the router.
What are your thoughts on this kindly guide me through this problem thanks.
Regards,
Usama Zaib
You just remove the 1N4007 Diode and try. If the problem is continuing, use LM7812 input from XL6009 and increase the voltage more than 13v.
@@MrAKsTime That diode option I've tried already it doesn't work I'll check that lm 7812 option and one more question that you've missed is that the reason of diode on the output.
@@MrAKsTime But according to the datasheet of XL 6009 it says that it's Min input can be i think 3/5 V there should not be any issues for this module to boost those voltages as batteries are giving 12 V even when it's discharged that bms property is that at almost 6-7 V it cut off so 6-7 V it should be no issue for this module to boost those voltages as it is made for this purpose.
@@MrAKsTime The XL6009 DC-DC Buck Boost Converter Module has an input voltage range of 3V to 32V, and an output voltage range of 5V to 35V.
I've checked it through the internet.
Can you tell me why my BMS shutdown automatic when I Am giving a load like 12v router ,samll LED bulb.
Check the battery capacity and ensure all the tracks are correct as per the diagram. Remove the buck module if you need 12v.
Hi bro .. just 1 more question:
1) Is there a scope of adding a "RELAY" to your project .. as a substitute for diode(i have heard from a lot of ppl that the diode gets really HOT when you put it on 12v circuit) .. please help me with this .. i am looking for a substitute for diode .. could u please help me ..
# The main objective of using a diode is to avoid the reverse current.
# Relay is not required for this module. From the day I made it to now, I am using this circuit every day. I didn't get any issues. Include heating problem and Anyway, I will check and let you know.
# You can use any barrier diode.
@@MrAKsTime : thanks bro .. i myself also tested a diode on a 12 v circuit .. and it didnt heat up .. diode i used is IN5822 .. thanks for the help !!!!
PS: i am making a UPs 12v one for a router .. and decided to not use a relay for the time being ..
You are genius teacher
Dear, if you want to make a 5 volt 2 amp USP, what components will be used?
The BMS discontinue the current flow as soon as hits below 11.5volts on the batteries. I have 6 18650 li_ion batteries connected to a 10A BMS 3S. The backup time is only a few minutes on a 12v 1amp internet modem. Please advise on how to increase the backup time. thank you
same problem mere sath bhi ho rahi mera router 12v 1.5A hy
but is ka solution mil gaya mujhy pehle me khud try karta hu i will let you know if i succeeded.
1 solution work kar chuka mere pas lekin 1 or solution try karta hu agr us me kamyab raha vo ziyada behtar
Did you use a 1n7004 diode to block reverse current in both input and output?
@@MrAKsTime yes, I have.
@@anisabibi5487 okay... Send me the pictures to t.me/mrakstime I will check it...
Can i use 10A bms board ? because i already purchased it 😢
Yes. Ensure output amp...
Output giving 2v only what can i do next?
@@tanveeralam410Adjust the voltage.
how do you actually charge this battery pack? voltage?
It will auto recharge using BMS.
XL6009 will reduce the back-up time. I hope we can avoid using it. What do you think. What will happed if we dont use XL6009. Is it neccessary ?
Or you can use LM7812 regulator to get constant output voltage, but you need more than 12v output to use this. Or try with xl6009 first, and monitor the battery life. Then decide.
@@MrAKsTime We cannot use LM7812 as we do not have more input voltage. The Nokia adapter hardly give 12.08V.
I’m sure this was posted with the best intentions and although it might work it’s not really ideal. Few things to note:
If using a 3S battery, the battery voltage will discharge from 12.6V to about 9V. So it is not supplying the constant 12V as the factory power supply does.
Lithium ion batteries need to be charged with some sort of constant current. I’m not quite sure how this circuit achieves this.
I’d say the concept is there but lacking attention to the finer details.
it will charge the battery with constant current using the BMS
A BMS is not a charger and does not control constant current or constant voltage.
Apakah bisa bms 2 s dicharger dengan charger hp 5 volt ditambah step up menjadi 8.4 volt,caranya bagaimana?
You need 9v charger to charge this 2s 18650 BMS and or you need step-up booster module XL6009 to increase the voltage from 5v to 9v.
I also make a video about this ❤
BMS has input current limit? Otherwise overcurrent 12V adapter when power returns no?
12v is a BMS input voltage and it has over-voltage protection. so no worry...
@@MrAKsTime You need xl4015 charge module to limit charging current.
BMS only goes into protect at 20A (and will not allow charge until disconnected).
Router power adapter is only rated 1 or 2A, Will overcurrent when li-ion battery at 9.6V is connected
@@Android-ng1wn you are absolutely right , charging should be limited to 2A, otherwise battery will get hot and even can burst, if the input supply has so.much power to feed, normal router adaptor will nit charge completely discharged cells
thanks for this. However, could you please give the numbers of the modules you used?
18650 Battery
LM2596
3S BMS for 18650
1N4007
6A Mini Switch
DC Female Jack
Also add XL4015 module and configure current limit to maximum of charger
@@Android-ng1wn XL4015 will give 5A current and BMS is 20A. BMS will control it...
@@MrAKsTime I'm talking about XL4015 module with adjustable Constant Current limit, search xl4015 lithum charger led driver.
When battery is empty and power comes back, charger will probably short circuit protect or blow (well below 20A) trying to power such a dead pack
@@Android-ng1wn you mean to replace the LM2596 with XL4015?
Plz Help ,, I made it But my Onu Going off On after 30 Minute , But my router still on long time ,, how to incraise back up with onu and router ,,
send me the images of your module at me mraktimes@gmail.com let me check first.
Heyy can i connect more battery in this same module ?
yes.
@@MrAKsTime i have to ask something more . Can i use the dish tv adapter as a phone charger?
@@Rahulsaini-tj9du if it is 5v up to 3a means you can use that.
@@MrAKsTime is there any module that can convert in to 5v?
@@Rahulsaini-tj9du Yes, search DC to DC 6-24V to 5V converter in google. you will get module with a USB female port.
can i use XL6009 ?
Yes, you can increase (XL6009) or decrease (LM2596). it's depends on your router input voltage.
ভাই ভুল করে যদি বেশি ভোল্টেজ হয়ে যায়
তাহলে কি রাউটার নষ্ট হয়ে যাবে
একটু জানাবেন দয়া করে
??????
I made this ups but when input power is off the ups works about 2 minutes then its not working,if i reconnect the input then its works ,please tell me the solution
Check the battery capacity. If you increase the capacity, it will work more hrs.
@@MrAKsTime mine input is 11.90v to 12.01v is this enough to charge the battery through bms
And i taking output as 12v
@@mohammedhafis7385 don't use buck module. Just check your modem ampere and add diode based on it.
Bahj ya ya bna hwa hwa kha sa mily ga or price
Please comment in English.
I m using diode 4007 in connected to bms as per ur diagram but the battery was not charging
mail me the image of the module that you made. I will check and let you know the details. mraktimes@gmail.com
@@MrAKsTime but my Diode is reducing the voltage
@@ashiqhussainbaig9801 you can use without diode.
if i want to add a led light, where should i connect it bro?
LM2596 has an SMD LED. You can use it. you can take the output from there.
@@MrAKsTime ohh.. Thanks brother.
Sir isme backup 30-40 min ka hi aa rha h.... Mene battery bhi 6 use ki h 2000 mh each....
Bms 20a ka use kiya h
Bro work kar rha hai kya apka ups
How to make 12 v power and 2A WiFi router Ups
Is short circuit protection available in this bms
Please dont tell lie!
Yes. If you have doubt. Watch video in youtube regarding this But i am sure.
Sir
This design is working, but there are one issue. When input is on, the battery is always in charging status, which is not good for the batteries, is harmful! batteries
if we don't change the plug , there will be no direct connection between the router and the main current. the batteries will give the current 24/7 , which is not a good idea
The router will run on battery 24/7 but the problem is when there is a power cut + the battery is also dry in a few min, you will not able to use the internet. It will create unwanted tension.
The main purpose of this module is to use the internet without any interruption even powercut.
@@MrAKsTime 😂
Does it support 12v 2a router
No, 1a only, but you can try.
@@MrAKsTime i try it its working 😍, btw thanks you ❤️
सर मे ईस पर कॅमेरा लगा सकता हु कया सर 12.1amp का
Yes, But ensure the output voltage before connecting.
bro IN4007 hitting issue
Auto charge or not?
It will auto-charge...
How to charge it? The router charger is 9v
You need a 12v charger to charge the battery. LM2596 will give you the 9v output.
Battery charger ho raha hai but backup bohot kaam mil raha hai
Dont use charging red or blue led please give me diagram connect with led thanks bro
which led you are you telling about.
dude, that battery is not fully charged. When you put a diode, the voltage drops. Not enough to charge the batteries.
Okay, just increase the diode value from 1amp to 2A or 3A diode.
@@MrAKsTime it doesn't matter. input voltage drops to 11.40. The batteries are not fully charged, any solution?
@@kevel3472 Using Diode is to avoid the reverse current. you can use it without a diode.
@@MrAKsTimediode part number for 1.5amps and 2amps please? Thank you
I was made 18650 lithium battery 3.7v 2200mah with three batteries ups I put charger 12v with 1A but it's battery drain so fast like 10 mints work only ??
okay... Send me the pictures to t.me/mrakstime I will check it...
@@MrAKsTime how to send u ?
@@aliabbas3351 By Telegram...
@@MrAKsTime ok bro I will send u after work
@@aliabbas3351 Take your own time bro...
4ell is not working for 3s! why?
Because it is 3cell BMS (3s), use 4cell BMS (4s)
@@MrAKsTime thanks 🙏
I made the same circuit, but with 10A BMS - working fine. Buit, the battery voltage is dropping automatically even if the input voltage is ON and is 12V. Why the battery voltage should drop ?? Where could be the problem ??
Because of 1N4007 diode, the voltage is dropping.
@@MrAKsTime because diode is there or because diode is not there ? what do you suggest. My Nokia adapter is of 12.08 Volt. When we use diode in series with adapter, then the voltage would drop further to 11.3 and charging will not happen upt o 12.5V to get more backup. What do you suggest ?