Charging a +/- 12v battery circuit

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Old 03-11-14, 02:04 PM
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Charging a +/- 12v battery circuit

Ok so I have two 1800mah li-ion batteries that i am going to use as a +/-12v power supply. My problem is the amplifier that I'm powering with the batteries needs a +12v and -12v current, so my solution is to connect the positive wire from batt1 to positive input of the amp, bridge the negative from batt1 and positive of batt2 to create a -12v source(connect that to -12v input on amp ) then lastly I'll connect the negative from batt2 to negative input of amp(if my wiring is right). I'm guessing I'm actually creating a 24v power source And I'm fine with dat as long as it works but the problem is now is how am I able to charge them, they each come with their on wall plug charger can i bridge an just use one or will I need a 24v charger and will it be safe to charge and use power at the same time
 
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Old 03-11-14, 06:53 PM
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Welcome to the forums.

It would be best to use the two individual chargers to charge those batteries as Li-ion batteries are not very forgiving with improper chargers/charging. 24v charging is definitely out.

You may be able to charge the batteries and run the amp. You'd need to measure the charging voltage to make sure it wasn't too high for the amp. You could possibly get charger noise in the amp when charging depending on the type of charger.
 
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Old 03-11-14, 07:11 PM
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Can I not just charge dem both with one 12v charger It doesn't matter if that lengthen the charge time needed
 
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Old 03-11-14, 07:22 PM
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Without knowing the specifics it's hard to say. Most Li-ion chargers monitor the battery voltage and sometimes battery heat to determine charge rate. Two batteries on one charger would keep the charger from seeing the true values.
 
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Old 03-11-14, 07:24 PM
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Is it safe to atleast try and is my wiring right to create the -12v
 
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Old 03-11-14, 07:37 PM
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By connecting the batteries like that you have created a +/-12v power supply.

I can't add anything else to the charging but if it's something you want to try.... make sure the batteries aren't inside anything they can harm. If the cells rupture you don't want anything damaged.
 
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Old 03-11-14, 08:02 PM
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I wasn't planning on being able to remove them from their incasement, I was going to have a jack in which to charge them, so I'm guessing I will have to have two jacks
 
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