I had 20 32700 grey (used) batteries from Ali-express promising at least 4500mAh. That is reasonable if you pay 30 euros including shipping to Europe. I estimated having 4000mAh on average with every cell. This gives me a 12.8v 20Ah usable capacity. I am satisfied with that. Using a 30 Watt fixed Solar panel behind glass i manage to charge it almost to full capacity (13.2v) in a single sunny day. If only 1 cell in this batch of 20 is bad or has significantly less capacity my battery is even half that or worse. The BMS will shut down at 10v. It is always a risk buying these used cells from a re-seller.
You may be 100% correct, but if they state 12 amps for a hole hour... they need to provide them... "Other wise, at least in my case, I would buy from someone else" No insult intended..
I bought 32700 (6000mah advertised) from AliExpress , tested about 10 out of 50. None of them had more than 4000mah . Open dispute already and they were saying that my charger it is not charging properly 😂. I’ve bought 12 same batteries from EBay 6 months before ordering from Ali , all of them 6200mah . My mistake, I was happy saving £80-90 now I have to send them back after 45 days delivering too. Never gonna do this again.
The max capacity of any 32700 cell (that is LFP) is no more than ~7000mAh. The technology is only at that point so far with cylindrical cells. I have yet to see anything test higher. I'm sure if one of the big names spent time on the 32700 cell they could make one thats 8000mAh.
Thank you! I've seen on Ali some lifepo big cells, was about to order a few due to the low price, but after this video, honestly i can't trust this battery provider.
Wait, so you measured about 3.6V in the beginning but when you started the test the batteries were only charged up to 3V? Wouldn't you get more capacity (Ah/Wh) discharging the batteries from 3.6V -> 2.5V instead of 3V -> 2.5V like you've shown in the vid? Why didn't you fully charge the batteries or am I missing something?
@@Bastelkiste1A oh ok, so you only got 5Ah even though they claim almost 13Ah. I found one of their products on Aliexpress that seems too good to be true. Look up "48V 18650 Lithium ion Battery Pack 100000mAh 1000w 13S3P XT60 100Ah For 54.6v E-bike Electric bicycle Scooter with BMS+charger". It's just a little north of 100AUD (~75USD) for a 100Ah battery!! And they seem to even be underselling the power as they claim 1kW but if you calculate 48V x max 30A you get near 1.5kW! Even if it's less than half the capacity as shown in your vid that seems like a good buy no?
@@rever4217 If the price is favourable, the risk is bearable. However, I would check with other manufacturers to see what capacities are normal there. The ones from daweikala will definitely not be better.
@@rever4217 What he's not telling you is his test rig is majorly flawed. See how he's using those aligator clips to USB? Yeah USB is definitely not the connector we want to use. We don't even want to use two wires. You need 4 wires. 2 to measure voltage and 2 for carrying current. He has his current carrying lines reading voltage which drags down the voltage meaning his cutoff voltage is not correct. If he measured the voltage of the battery at the terminals with a separate multimeter they would have a higher voltage than what is shown. USB cables typically have thin wires which is why you'll see a phone charging at 2A might drag down the 5.15V USB to 4.90V or something (if its a quality charger). These could very well be 6Ah or 7Ah each but we can't use this test to tell us anything. Notice the resistance reading the bottom right corner of the screen. It should be in milliohms. Like 0.070 ohms is 70 milliohms. These cells likely have an IR of 20? milliohms? and your wire should be thick enough to not add much more maybe another 20-50 milliohms.
the voltage after full charged of a LiFePO4 is about 3.65V then the capacity comes at the end of discharge as 2.50V. if so the capacity will be much more than seen here, right ?
Es handelt sich um gebrauchte Batterien. Sie wurden neu verpackt. Auf der neuen Verpackung haben sie eine große Kapazität geschrieben. Dadurch erhöht sich das Umsatzvolumen. Dies sind 5500- oder 6000-mAh-Akkus. Sie müssen sie auf 2,00 V entladen, um die tatsächliche Kapazität zu erhalten. Gestern habe ich 1 Stück zum Probieren bestellt. Wenn ich dein Video früher gesehen hätte, hätte ich es nicht gemacht. danke fürs testen. Ruhm der Ukraine!
The fact that the test setup is not ideal does not change the fact that the battery has only half the specified capacity. According to the manufacturer, discharge voltage 2.5V as with all Lifepo4 batteries.
@@Bastelkiste1A its more than not ideal. Its wrong. Measure the battery voltage at the terminal with a multimeter. I guarantee when your tester say 2.5V your multimeter will say 2.8V or something around there. Using USB as the connector is also a poor choice. High resistance.
this mfg. is fraud. we should ask for 53% of our money back as at best we only got 47% of the max possible capacity. and after that not do business with them again until they tell truth on capacity.
To many fake battery from china.they claim it 12.8Ah but real spec is 6-5Ah. maybe we need to fine datasheet some item from china before buy or find some reviews before buy
ich danke dir für deinen Stumfilm, ich hatte vermutet das bei der Größe immerhin 6Ah kommen, aber hohe Ströme werden die schaffen und 33€ für 10-12 Stück bei Ali geht,
i just bought 120 of these and they are junk im so pissed im an electrical engineer and set up my own testing also . At 1 amp of current they only provided about 5.00hrs of 1am from charged to 2.5 volts and it was dropping fast so i know i was near the end of the charge on it . waste of time and money .I would add my test pics but i cant upload them here i guess .
You are using an incorrect way to measure batteries, the value marked on the packaging is the load capacity, not the maximum amount of amps it can deliver, it is a nominal value, you should have indicated how long you kept the device on and thus multiply the amount current input with operating time.
I have no idea where you got your information. The datasheet says capacity 12800mah. When I test other 3.2V Lifepo4 with e.g. 200AH, it also says 200AH.
if the 6000 mAh battery weighs 145 g and the 12000 mAh battery weighs 145 g then there is not more juice in the bottle ;-). I don't know how they get away with selling this shit ? that would be same technology but twice the energy density. Don't fall for that. Some folks her said its used cells repacked. I am not sure about that. Its just "the same old s..t". The only batteries I ever tested above rated capacity where myn Winston 200Ah LifePo4 cells. 8 of them, all above capacity. And they were not cheap and I'm super happy with them. I want to build a 12 V - 50-60 Ah (or two with 30 Ah) for my trolling motor so of course it was tempting to use 8 of these "wonder cells" getting 25 Ah each pack. Wishful thinking. Great to find these videos showing the scams.
Yes it is unbelievable that such a fraud takes place. But people are no longer so stupid and do not let themselves be fooled by the Chinese. Thanks for your feedback 👍
@@Bastelkiste1A If we talk about half capacity then thats no longer marketing "enhancement". Thats called FRAUD. But it works. I am an electronics guy and i spent hours to research of what I already knew ;-). We just like it to get double size sausages for half the price ;-).
@@Bastelkiste1A my late mother always used to say "wo's was omsonscht gibt, send de meischte Leut, ond au de meicshte lange Gsichter" ;-). But you are correct. With todays fast info spreading its much easier to do research in these matters. If we can hold the wallet closed long enough. But some people simply don't understand stuff like energy density. If we'd been able to pack twice the power into a battery at same weight, using the same elements, wow, that would be like three UFO's hovering in front of the living room window ;-).
I had 20 32700 grey (used) batteries from Ali-express promising at least 4500mAh. That is reasonable if you pay 30 euros including shipping to Europe. I estimated having 4000mAh on average with every cell. This gives me a 12.8v 20Ah usable capacity. I am satisfied with that. Using a 30 Watt fixed Solar panel behind glass i manage to charge it almost to full capacity (13.2v) in a single sunny day. If only 1 cell in this batch of 20 is bad or has significantly less capacity my battery is even half that or worse. The BMS will shut down at 10v. It is always a risk buying these used cells from a re-seller.
You may be 100% correct, but if they state 12 amps for a hole hour... they need to provide them... "Other wise, at least in my case, I would buy from someone else" No insult intended..
I bought 32700 (6000mah advertised) from AliExpress , tested about 10 out of 50. None of them had more than 4000mah . Open dispute already and they were saying that my charger it is not charging properly 😂.
I’ve bought 12 same batteries from EBay 6 months before ordering from Ali , all of them 6200mah . My mistake, I was happy saving £80-90 now I have to send them back after 45 days delivering too. Never gonna do this again.
The max capacity of any 32700 cell (that is LFP) is no more than ~7000mAh. The technology is only at that point so far with cylindrical cells. I have yet to see anything test higher. I'm sure if one of the big names spent time on the 32700 cell they could make one thats 8000mAh.
Thanks for the test.
😃🇧🇷👍🏼
😊✌️🇩🇪
even though it's a 5000mah battery it's good for the price buy several units parallel series and dalli solar energy
Thank you! I've seen on Ali some lifepo big cells, was about to order a few due to the low price, but after this video, honestly i can't trust this battery provider.
Wait, so you measured about 3.6V in the beginning but when you started the test the batteries were only charged up to 3V? Wouldn't you get more capacity (Ah/Wh) discharging the batteries from 3.6V -> 2.5V instead of 3V -> 2.5V like you've shown in the vid? Why didn't you fully charge the batteries or am I missing something?
No, I started the test with full batteries.
So from 3.6V to 2.5V.
@@Bastelkiste1A oh ok, so you only got 5Ah even though they claim almost 13Ah. I found one of their products on Aliexpress that seems too good to be true.
Look up "48V 18650 Lithium ion Battery Pack 100000mAh 1000w 13S3P XT60 100Ah For 54.6v E-bike Electric bicycle Scooter with BMS+charger".
It's just a little north of 100AUD (~75USD) for a 100Ah battery!! And they seem to even be underselling the power as they claim 1kW but if you calculate 48V x max 30A you get near 1.5kW!
Even if it's less than half the capacity as shown in your vid that seems like a good buy no?
@@rever4217 If the price is favourable, the risk is bearable.
However, I would check with other manufacturers to see what capacities are normal there.
The ones from daweikala will definitely not be better.
@@Bastelkiste1A Alright thank man, you've been a great help.
@@rever4217 What he's not telling you is his test rig is majorly flawed. See how he's using those aligator clips to USB? Yeah USB is definitely not the connector we want to use. We don't even want to use two wires. You need 4 wires. 2 to measure voltage and 2 for carrying current. He has his current carrying lines reading voltage which drags down the voltage meaning his cutoff voltage is not correct. If he measured the voltage of the battery at the terminals with a separate multimeter they would have a higher voltage than what is shown. USB cables typically have thin wires which is why you'll see a phone charging at 2A might drag down the 5.15V USB to 4.90V or something (if its a quality charger).
These could very well be 6Ah or 7Ah each but we can't use this test to tell us anything. Notice the resistance reading the bottom right corner of the screen. It should be in milliohms. Like 0.070 ohms is 70 milliohms. These cells likely have an IR of 20? milliohms? and your wire should be thick enough to not add much more maybe another 20-50 milliohms.
THANK YOU VERY MUCH!!
Did you power the capacity tester from the same battery? If yes it wouldn't give a correct reading.
As shown in the video, I tested four cells of the same type.
With multiple runs.
@@Bastelkiste1A what you use to power the capacity tester?
A 12Volt power supply unit
This size LFP usually 6Ah. Not more.
Muchas gracias
the voltage after full charged of a LiFePO4 is about 3.65V then the capacity comes at the end of discharge as 2.50V. if so the capacity will be much more than seen here, right ?
Exactly.
The capacity is reached at the voltage drop up to 2.5V.
Nope, the batteries are fully charged, but the voltage drops right away, when he connected it to load (1A).
Nice video and thanks for the info
Cheap USB connector can't transfer voltage correctly under load! You need to use strong connecting cables.
Es handelt sich um gebrauchte Batterien. Sie wurden neu verpackt. Auf der neuen Verpackung haben sie eine große Kapazität geschrieben. Dadurch erhöht sich das Umsatzvolumen. Dies sind 5500- oder 6000-mAh-Akkus. Sie müssen sie auf 2,00 V entladen, um die tatsächliche Kapazität zu erhalten. Gestern habe ich 1 Stück zum Probieren bestellt. Wenn ich dein Video früher gesehen hätte, hätte ich es nicht gemacht. danke fürs testen. Ruhm der Ukraine!
Danke für dein Feedback 👍
😃🇧🇷👍🏼
thanks :)
Спасибо👍
Пожалуйста.
Dzięki za film . Nie warto kupować . Twierdzą że można rozładować 8C😂
Using a two wire setup to test capacity isn't going to be ideal. Also, these batteries state they can be discharged down to 2v, not 2.5v.
The fact that the test setup is not ideal does not change the fact that the battery has only half the specified capacity.
According to the manufacturer, discharge voltage 2.5V as with all Lifepo4 batteries.
@@Bastelkiste1A its more than not ideal. Its wrong. Measure the battery voltage at the terminal with a multimeter. I guarantee when your tester say 2.5V your multimeter will say 2.8V or something around there. Using USB as the connector is also a poor choice. High resistance.
Says cut off is 2.5v from the info I read.
5.1ah×2.5v ~ 12750 watt hour
Lithium battery capacity ~ 250/kg
250/12.7 ~ 20
Does each cell weigh approximately 20 grams?
I mean 50 grams
Probably more, they are huge cells.
How the hell did you calculate 12750 watt hours from that, redo everything.
I have daweikala 18650 batteries (3500mAh promised) and they weigh 47.5~ grams.
@@davidd2661 milliwat hours lol
this mfg. is fraud. we should ask for 53% of our money back as at best we only got 47% of the max possible capacity. and after that not do business with them again until they tell truth on capacity.
To many fake battery from china.they claim it 12.8Ah but real spec is 6-5Ah. maybe we need to fine datasheet some item from china before buy or find some reviews before buy
That is the problem.
And then the whole thing is talked up by some people.
They are certainly all bought
ich danke dir für deinen Stumfilm, ich hatte vermutet das bei der Größe immerhin 6Ah kommen, aber hohe Ströme werden die schaffen und 33€ für 10-12 Stück bei Ali geht,
Ja, hohe Ströme machen die mit.
Wieder so sein Taubstummen Video?!?!?
anyone know the max charging current for these junk cells i have 120 of them
How many volts should your battery have?
12,24 or 48
i was looking for the max charge current for one of these cells cannot find anything on the web just the fake discharge ratings . @@Bastelkiste1A
You can charge them with 10A
🙏
i just bought 120 of these and they are junk im so pissed im an electrical engineer and set up my own testing also . At 1 amp of current they only provided about 5.00hrs of 1am from charged to 2.5 volts and it was dropping fast so i know i was near the end of the charge on it . waste of time and money .I would add my test pics but i cant upload them here i guess .
Thank you, I'll stay away from this brand👍🏼 con artists
You are using an incorrect way to measure batteries, the value marked on the packaging is the load capacity, not the maximum amount of amps it can deliver, it is a nominal value, you should have indicated how long you kept the device on and thus multiply the amount current input with operating time.
I have no idea where you got your information.
The datasheet says capacity 12800mah.
When I test other 3.2V Lifepo4 with e.g. 200AH, it also says 200AH.
if the 6000 mAh battery weighs 145 g and the 12000 mAh battery weighs 145 g then there is not more juice in the bottle ;-). I don't know how they get away with selling this shit ? that would be same technology but twice the energy density. Don't fall for that.
Some folks her said its used cells repacked. I am not sure about that. Its just "the same old s..t".
The only batteries I ever tested above rated capacity where myn Winston 200Ah LifePo4 cells. 8 of them, all above capacity. And they were not cheap and I'm super happy with them.
I want to build a 12 V - 50-60 Ah (or two with 30 Ah) for my trolling motor so of course it was tempting to use 8 of these "wonder cells" getting 25 Ah each pack. Wishful thinking. Great to find these videos showing the scams.
Yes it is unbelievable that such a fraud takes place.
But people are no longer so stupid and do not let themselves be fooled by the Chinese.
Thanks for your feedback 👍
@@Bastelkiste1A If we talk about half capacity then thats no longer marketing "enhancement". Thats called FRAUD. But it works. I am an electronics guy and i spent hours to research of what I already knew ;-). We just like it to get double size sausages for half the price ;-).
@@novelistusonthewater We are greedy🙈
@@Bastelkiste1A my late mother always used to say "wo's was omsonscht gibt, send de meischte Leut, ond au de meicshte lange Gsichter" ;-).
But you are correct. With todays fast info spreading its much easier to do research in these matters. If we can hold the wallet closed long enough. But some people simply don't understand stuff like energy density. If we'd been able to pack twice the power into a battery at same weight, using the same elements, wow, that would be like three UFO's hovering in front of the living room window ;-).
@@novelistusonthewater Oh, what a beautiful statement from your mother.
I know the saying too, but it's true.
Is your mother German?
sind zwar fake , aber immer noch günstiger auf die menge
von der kapazität als wenn man sie irgendwie in deutschland kauft
ありがと！騙されるところだった！！！
だから、このビデオを作ったんです。
一方、性能データはほぼすべて間違っている。
日本へのご挨拶
Tylko 4200mAh
Solo tienen 5ah 😮
Sí, eso es todo.
Dear God look at that horrendous voltage drop. Probably mostly from your leads. You need a 4 wire setup
I now have a 4 wire tester.
And shall I tell you something?
It does not get better with the capacity.
Speak up man!