I would just like to agree with what 30GB said about the voltage levels he stated, as they are pretty much the max and min you want to go. I only say because you don't want to try and charge a damaged Li-ion battery, they can be dangerous.
Also, when max voltage is reached, the battery will be at about 70% charge, as the current wont be at the rated level yet. But unless you know what your doing and have a circuit to monitor the current and cut off then it could be dangerous to go any further
Just read this Wikipedia article: Lithium-ion battery. Maybe more than you want to know, but some bits you ought to know (like what is know to make them blow up). Recommend a (replaceable) fuse. How do you recharge it?
A single Schottky diode (1A rectifier) will do the same as 3 you are using with only 0.5V drop (instead of 1.8V). To block reverse currents above the leakage (microamp) level, one diode is as good as 3. Must watch again to find out what exactly you are protecting against.
The three pin/terminal LM317 IC chip can handle 1.5 amps at about 1.2 to 30 or so volts. Only a few parts needed. That can be used as a stable voltage regulator. The supply voltage needs to be about 1 or 2 volts above the output voltage due to losses in the chip. Then use a resistor to limit the output current, which in your case would be the lowest charging current of all he batteries since they are in series, maby 100ma or so maby.
My advice is to use schotty dioes instead of silicon diodes because in silicone dioes, most of the voltage is lost at the P-N junction. Schotty diodes have a metal plate connecting the positive and negative doped silicone. That means less votage is lost in the junction.
yep looks like you need a regulator. I have a 5v 1.5a regulator and i use it on my 8.40v lipo battery for rcs to charge my devices but lipos can only charge max per cell is 4.20v and can go lowest of 3v if any lower or higher will damage the lipos
@30GB Thanks for the stats I will remember that, also the amp I am using has a USB port on it so I might re solder the USB wire back on......DOH!....;-)
@JHx86 Probably not because regular 12v lead acid battery chargers will deliver too much current for the batteries and their diodes, which could lead to a meltdown.
The website batteryuniversity has a good article on charging lithiums. I'll send the specific link.
trailkeeper 1 year ago
With the diodes in place, how do you charge it?
RupertsCrystals 1 year ago
I would just like to agree with what 30GB said about the voltage levels he stated, as they are pretty much the max and min you want to go. I only say because you don't want to try and charge a damaged Li-ion battery, they can be dangerous.
Also, when max voltage is reached, the battery will be at about 70% charge, as the current wont be at the rated level yet. But unless you know what your doing and have a circuit to monitor the current and cut off then it could be dangerous to go any further
elecbeg 1 year ago
@elecbeg Yeah, I have witnessed it happen, I have a fire extinguisher. You can Live life or watch as it goes by.......;-)
kubikop 1 year ago
Just read this Wikipedia article: Lithium-ion battery. Maybe more than you want to know, but some bits you ought to know (like what is know to make them blow up). Recommend a (replaceable) fuse. How do you recharge it?
prhughes0 1 year ago
@prhughes0 I use a trickle charger up to 0.1 Amp, and it uses an automatic shut off when the raises in current too high....
Its Nice and Safe....
Paul..
kubikop 1 year ago
There are two types of Li-ion batteries, only one type can be recharge. Might try a Bedini pulse charger.
hhoforvolts 1 year ago
A single Schottky diode (1A rectifier) will do the same as 3 you are using with only 0.5V drop (instead of 1.8V). To block reverse currents above the leakage (microamp) level, one diode is as good as 3. Must watch again to find out what exactly you are protecting against.
prhughes0 1 year ago
@prhughes0 Thanks, I will look into them...
kubikop 1 year ago
The three pin/terminal LM317 IC chip can handle 1.5 amps at about 1.2 to 30 or so volts. Only a few parts needed. That can be used as a stable voltage regulator. The supply voltage needs to be about 1 or 2 volts above the output voltage due to losses in the chip. Then use a resistor to limit the output current, which in your case would be the lowest charging current of all he batteries since they are in series, maby 100ma or so maby.
trailkeeper 1 year ago
@trailkeeper That could be good, for a variable power supply you mean?
kubikop 1 year ago
@kubikop Yes, maby to charge the rechargeable batteries and still use for other purposes.
trailkeeper 1 year ago
@trailkeeper They work really well, you can power anything 12v's with it....
kubikop 1 year ago
My advice is to use schotty dioes instead of silicon diodes because in silicone dioes, most of the voltage is lost at the P-N junction. Schotty diodes have a metal plate connecting the positive and negative doped silicone. That means less votage is lost in the junction.
TheNuclearWatermelon 1 year ago
@TheNuclearWatermelon I will look into them thanks for the response...
Paul..
kubikop 1 year ago
yep looks like you need a regulator. I have a 5v 1.5a regulator and i use it on my 8.40v lipo battery for rcs to charge my devices but lipos can only charge max per cell is 4.20v and can go lowest of 3v if any lower or higher will damage the lipos
30GB 1 year ago
@30GB Thanks for the stats I will remember that, also the amp I am using has a USB port on it so I might re solder the USB wire back on......DOH!....;-)
kubikop 1 year ago
can you charge that with a regular 12v charger (e.g. sealed lead acid battery charger)
JHx86 1 year ago
@JHx86 Probably not because regular 12v lead acid battery chargers will deliver too much current for the batteries and their diodes, which could lead to a meltdown.
TheNuclearWatermelon 1 year ago
@TheNuclearWatermelon I agree!!
kubikop 1 year ago
@JHx86 You can with a trickle charger... but not with say a 5Amp one......There may be fire ahead.....lol
kubikop 1 year ago