you are very smart dude. and thats coming from a self made electronics engineer with 37 years of electronics engineering with multiple u.s. electronics patents. i have the smarthings home automation system and was ready to design a battery eliminator circuit using rechargable aa batteries to give me 3 vdc at 1800 ma for a 5-year long term smart sensor power supply but if this works ill give it a try. the ratings on a regulat 2450 battery is rated at 600ma. rechargable 2450 is about 200ma max. at that rate it should last 1/3 the time as a regular 2450 but being rechargeable should pay for itself in time. ill give it a try and see how long it lasts. thx again dude.
Thanks, I appreciate it, but I was going down the same path you were until I found these rechargeable 2450 cells. Yes, they do last about 1/3 the time. For the outdoor version (th-cam.com/video/_kKiIegkN_I/w-d-xo.html ), I'm working to add a small solar panel and a low current Li-ion charger to keep the battery charged so I never have to change it.
Couldn't find a spec sheet for the multipurpose sensor to check the battery voltage. I too tried a 3.7v LIR a few years back - worked like a charm and shorted a battery myself. Often times our thumb would act as a ground to discharge the excess before it touches the negative. Would be great to know how you progressed with the solar panel I was thinking to do similar.
@@engineerable I did something similar, but instead of using a solar panel and charger, I wired up a larger CR123 battery. I will look into a small solar panel and charger though as regardless of size, batteries always seem to last less than they should. Have you considered a larger rechargeable battery. There is plenty of room in that enclosure so you could use a larger battery...
You said that this battery has 1/4 of capacity compared with normal battery, this battery has about 40-60mah on the other hand normal battery has 225mah, I was thinking about buying it, but now I don't know if it's a good idea. 🤔
LIR2450 rechargeables should have ~120mah vs 600mah for non rechargeable. www.powerstream.com/p/Lir2450.pdf So, I have to swap the rechargeables about once every 3-4 months vs once a year.
The normal charge cut off for Li ion batteries is 4.2V, so that is normal for the battery to reach that. When a load is connected, it will drop rapidly to 3.7V nominal. I found that they work fine in Smarthome products, but did not work in MyQ garage door sensor. It didn't damage the sensor, but the sensor would not work while the battery was in due to the higher voltage. A controlled discharge tool can be used to discharge to a specific voltage, like this - amzn.to/3LRZAa4
Thanks so much for the info. When I charge the batteries, I'm only leaving it on for a few minutes, turning it off before the light turns blue. So the voltage will rest at about 3.7 volts. I going to use flameless candles as a load to off load the extra charge before putting the batteries in sensitive electronics. Hope this works.
Or simply add some DC-DC step down circuit to set the voltage you want on the output and small LiOn charging circuit with solar panel/USB C plug on the input side so you can always charge it using for example powerbank if there's not enough sun@@engineerable
@@bunio14 I'm setting up some outdoor ones to solar charge, here's how: www.engineerable.com/single-post/diy-waterproof-solar-powered-smartthings-contact-sensor-outdoor-z-wave-zigbee-door-smarthome
That's a pretty bad design on that sensor, how it can short the battery so easily. Maybe a little creative bending might help. If you are installing a charging circuit in that box, install a better external battery holder inside the box. You can also go with a larger size battery.
Hello my friend ... I want to save money, would you advise me to buy a rechargeable welding helmet? How long does it take to finish shipping it approximately?
The resistance of dry skin is too high to discharge a 3V battery. It is therefore perfectly safe to hold it across the positive and negative side because it does not have a high enough voltage potential to conduct through the skin.
g@@jaspercochran1535 I was always told the same thing. These coin cells have such a small amount of current in them that just your skin can drain a lot out of them. Just in case I always handle them with something non conductive.
you are very smart dude. and thats coming from a self made electronics engineer with 37 years of electronics engineering with multiple u.s. electronics patents. i have the smarthings home automation system and was ready to design a battery eliminator circuit using rechargable aa batteries to give me 3 vdc at 1800 ma for a 5-year long term smart sensor power supply but if this works ill give it a try. the ratings on a regulat 2450 battery is rated at 600ma. rechargable 2450 is about 200ma max. at that rate it should last 1/3 the time as a regular 2450 but being rechargeable should pay for itself in time. ill give it a try and see how long it lasts. thx again dude.
Thanks, I appreciate it, but I was going down the same path you were until I found these rechargeable 2450 cells. Yes, they do last about 1/3 the time.
For the outdoor version (th-cam.com/video/_kKiIegkN_I/w-d-xo.html ), I'm working to add a small solar panel and a low current Li-ion charger to keep the battery charged so I never have to change it.
Whats your experience? How much loss in comparison to the non-rechargebles?
Couldn't find a spec sheet for the multipurpose sensor to check the battery voltage.
I too tried a 3.7v LIR a few years back - worked like a charm and shorted a battery myself. Often times our thumb would act as a ground to discharge the excess before it touches the negative.
Would be great to know how you progressed with the solar panel I was thinking to do similar.
Thanks for the tip. I have all the parts for the solar panel mod, just need to finish it so I don't have to replace the battery every few months.
@@engineerable I did something similar, but instead of using a solar panel and charger, I wired up a larger CR123 battery. I will look into a small solar panel and charger though as regardless of size, batteries always seem to last less than they should. Have you considered a larger rechargeable battery. There is plenty of room in that enclosure so you could use a larger battery...
You said that this battery has 1/4 of capacity compared with normal battery, this battery has about 40-60mah on the other hand normal battery has 225mah, I was thinking about buying it, but now I don't know if it's a good idea. 🤔
LIR2450 rechargeables should have ~120mah vs 600mah for non rechargeable. www.powerstream.com/p/Lir2450.pdf
So, I have to swap the rechargeables about once every 3-4 months vs once a year.
I was thinking the same thing. As cheap as the normal batteries are, I am just not sure if it is worth it.
🤘 Thank you!
Charging duration how.much
Fantastic video!🙏
Thanks!
My LIR2450 batteries charged to 4.15 volts. Is that too high for sensors?
The normal charge cut off for Li ion batteries is 4.2V, so that is normal for the battery to reach that. When a load is connected, it will drop rapidly to 3.7V nominal. I found that they work fine in Smarthome products, but did not work in MyQ garage door sensor. It didn't damage the sensor, but the sensor would not work while the battery was in due to the higher voltage. A controlled discharge tool can be used to discharge to a specific voltage, like this - amzn.to/3LRZAa4
Thanks so much for the info.
When I charge the batteries, I'm only leaving it on for a few minutes, turning it off before the light turns blue. So the voltage will rest at about 3.7 volts.
I going to use flameless candles as a load to off load the extra charge before putting the batteries in sensitive electronics. Hope this works.
Or simply add some DC-DC step down circuit to set the voltage you want on the output and small LiOn charging circuit with solar panel/USB C plug on the input side so you can always charge it using for example powerbank if there's not enough sun@@engineerable
@@bunio14 I'm setting up some outdoor ones to solar charge, here's how: www.engineerable.com/single-post/diy-waterproof-solar-powered-smartthings-contact-sensor-outdoor-z-wave-zigbee-door-smarthome
That's a pretty bad design on that sensor, how it can short the battery so easily. Maybe a little creative bending might help. If you are installing a charging circuit in that box, install a better external battery holder inside the box. You can also go with a larger size battery.
Yes, I've upgraded some to use cylindrical lithium batteries or 18650 batteries
Hello my friend ... I want to save money, would you advise me to buy a rechargeable welding helmet? How long does it take to finish shipping it approximately?
How would he know? You didn't even say where you live. Dummy.
No usb c😑
Too bad CR1220 batteries aren't rechargeable.
There are LIR1220 cells, but I don't know if there are suitable chargers or if you would have to design something on your own.
You keep handling the batteries by grabbing the positive and negative sides and it's KILLING ME DX
The resistance of dry skin is too high to discharge a 3V battery. It is therefore perfectly safe to hold it across the positive and negative side because it does not have a high enough voltage potential to conduct through the skin.
@@engineerable really? I was always told to hold the coins on the side so’s not to drain the battery or shorten its life.
@@jaspercochran1535
really.
You can actually measure the leakage with a simple multimeter.
g@@jaspercochran1535 I was always told the same thing. These coin cells have such a small amount of current in them that just your skin can drain a lot out of them. Just in case I always handle them with something non conductive.