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Old Jan 09, 2013, 09:14 AM
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Newbie question on Parallel charging

I have a balance charger that outputs 3amps (also has 2 and 1 amp setting). I want to be able to charge multiple lipos at the same time. I purchased this:

The lipos are all 3S 2200mAh. For now, I just want the convenience of hooking up 3 batteries and letting them charge overnight. I'm thinking that the actual charging time will still be longer than changing one Lipos since I'm only outputting a total of 3amps(correct?).
At some point, I would look at getting a more capable charger that could reduce the time it takes to charge as well.
So, am I on the right track here? Thanks for your help!
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Old Jan 09, 2013, 09:24 AM
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United States, MN
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Suggest you read this site:
https://sites.google.com/site/tjingu...arging-how-tos

And then don't do what you are talking about doing, buy a better charger first. Rule one of charging lipos is don't leave them unattended. Many of the stories of fires are from people who left them charging overnight while the slept.
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Old Jan 09, 2013, 09:40 AM
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I did a ton of reading thru these threads on chargers etc. My first charger was a 50 watt Hyperion ac/dc. The best info I gleaned from all the threads was put your top dollars into a good charging system right off the bat. I don't recall how many threads I read where the person was on there 3rd or 4th cheapo charger.
I used to do 1 batt 2200 3s at a time. I finally assessed what I wanted to do for the next 2-3 years and went with a Step Up from PRC..500 watt power server and an I charger and a board like you showed (deans connectors). All in was maybe 225.00Now I want to build or buy a storage/discharger for when I don't use the batteries so I can quickly draw them down.
Take a look at PRC or EP buddy. There are many others but these had a variety of Systems and PRC will answer your questions quickly.
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Old Jan 09, 2013, 10:49 AM
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3 2200mah batteries would charge at 6.6amps for a 1c rate so at 3amps you are just under .5c so I would guess it would take 2 1/2 - 3hrs. to charge them. So if you can watch them for that long or have a good fireproof place to charge them it won't take overnight.
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Old Jan 09, 2013, 11:05 AM
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Quote:
Many of the stories of fires are from people who left them charging overnight while the slept.
YIKES! I left one Lipo connected in my garage before heading to work!
I'll be leaving from work early today!

I have looked at umpteen posts on batteries and parallel charging and most get into details far over my head. The link above is pretty concise and I think i understand the basics.
Since I can't leave them overnight, I'll just have to plan time to charge them so i can keep an eye on them. If it really is 2-3 hours, that's not bad at all.

Thanks for your help!
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Old Jan 09, 2013, 06:05 PM
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Hey guys, I'm a bit confused here, If I just want to balance charge the 3 3S 2200mAh on a charger like this, I have to have the balancing leads and the discharge leads hooked up? I figured you could just plug only the balance leads in and charge it that way?

Sorry, still a noob in the electrical department.
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Old Jan 09, 2013, 06:08 PM
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Most chargers charge through the discharge leads because the small wire of the balance leads can only handle a few amps. In theory you can use the parallel board with that type of charger just using the balance connectors, but there's a slim possibility you will burn up the board as those traces on the board normally only see about 500ma using a normal charger and were probably designed with that current load in mind. You'll notice the main traces in the center are much much thicker to handle the higher current of a normal charger.
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Old Jan 09, 2013, 06:27 PM
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Quote:
Originally Posted by leatherlips View Post
Since I can't leave them overnight, I'll just have to plan time to charge them so i can keep an eye on them. If it really is 2-3 hours, that's not bad at all.
I parallel charge in the garage at 3C on 3 chargers (for different cell counts) and the time it takes to charge 10-14 batteries is about the time it takes to get the car all packed up. Somewhere around 20 minutes.
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Old Jan 09, 2013, 06:28 PM
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Quote:
Originally Posted by grimbeaver View Post
Most chargers charge through the discharge leads because the small wire of the balance leads can only handle a few amps. In theory you can use the parallel board with that type of charger just using the balance connectors, but there's a slim possibility you will burn up the board as those traces on the board normally only see about 500ma using a normal charger and were probably designed with that current load in mind. You'll notice the main traces in the center are much much thicker to handle the higher current of a normal charger.
That answers my question perfectly..Thank you Grimbeaver!
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