WHAT CHARGE RATE DO I USE ??????? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 05-29-2004, 03:29 AM   #1
Don M.

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I have 2 - 1800 mah batteries wired in parallel in order to give me 3600 mah. My question is, can I charge these at 360 mah or do I need to limit the charge rate to 180 mah.
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Old 05-29-2004, 06:17 AM   #2
Bob Hudson
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seperate packs

I suggest you do not wire them in parallel.

Keep them as seperate packs, with their own switch harnesses and charge jacks.

Plug each of the 2 packs into their own port on the reciever
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Old 05-30-2004, 02:31 AM   #3
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Sorry to hijack this thread but why would parallel be different than plugging into the same receiver. That would seem to mean wired in parallel to me???
Charging them separately I might understand!??
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Old 05-30-2004, 05:18 AM   #4
Ken Baker
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I think he meant keep them separate so they can be charged separately.
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Old 05-30-2004, 06:09 AM   #5
Bob Hudson
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Ken is correct. Each of your 1800ma packs could have different internal characteristics. Treating them as truely seperate packs helps eliminate any of these "anomalies"

Also, if you DO wire both packs into a single parallel pack and something goes wrong with any one of those single cells the whole "system" will be affected. ( such as an open cell or open cennection fron one cell to another, an shorted cell, you name it.)

With the "2 pack" system you create a "backup" or redundant" system. If one pack goes south on you you will still have power. EVEN if one pack goes into a dead short condition.

On my 40% Edge 540 I run 2 receivers. Each receiver has two 1650ma packs on it. I have been using this "system" for 5 years now. It woks fine.

You may argue that "hey, now I have to charge 2 packs instead of 1".

I have not analysed it, but I'm sure your effective charge times would be very similar whether you run 2 smaller capacity packs and charge them 1 at a time ( as I do) or 1 combined pack.

It works, and it isn't any more skin off your back, only your wallet.

Hope I have been of some help.

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Old 05-30-2004, 09:10 AM   #6
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Check out the information on charging batteries in Red's R/C Battery Clinic. you will find that Bob is absolutely correct about paralel charging. It is highly not recommended to charge cells this way. Take the advice given and keep them as seperate packs and charge them seperately.

Hooking them up the way Bob suggested does give you parallel operation and doubles your mAh rating but it allows you to charge them as seperate packs.
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Old 05-31-2004, 08:44 AM   #7
Don M.

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Actually I contacted Red and he gave me the answer (within 10 mins.) to charge at 360 but keep an eye for too much heat in 1 battery.

I can tell some of you are wondering why I did this. Well first of all it's for an onboard glow, so no big deal if it packs it in, second I had the 2 - 1800 mah batteries and nothing else to do with them, third it fit better where I wanted to put it instead of 1 larger battery & fourth this is the 3rd season I've been using it and it's worked great. I just aquired a charger capable of higher charge rates, hence the question.
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