G+_Claude Gregoire Posted May 17, 2015 Share Posted May 17, 2015 I have two 2 cell 2200 mah batteries and I was wondering if it would be safe to charge both batteries at the same time on my Imax b6 charger with this multi port adapter that you can see in the picture below. If so what setting would I need to set on my charger to make it happen? Thanks Claude Link to comment Share on other sites More sharing options...
G+_Eddie Foy Posted May 17, 2015 Share Posted May 17, 2015 Interesting question. Not sure I'd try it. I'd think you'd have to make it look like a 4s. But then the power leads would be showing a horribly wrong voltage. You might be able to plug the 2 balance cables into the 4S (with mods since you will have 2 GND/common leads) then put the 2 power leads in series to double the voltage. Too much work for a sketchy set up. I'm thinking the cost of making the pigtails, and what your time is worth, a second charger might be a better option. Link to comment Share on other sites More sharing options...
G+_Nick Whitworth Posted May 17, 2015 Share Posted May 17, 2015 Yes. Is very commonly done for larger models. It's called parallel charging. Google around, there are lots of very good websites that explain it. Basically you just plug in two identical batteries in parallel. It becomes a battery with double the capacity, so set the charge rate to the new 1c charging rate. Link to comment Share on other sites More sharing options...
G+_Nick Whitworth Posted May 17, 2015 Share Posted May 17, 2015 Just make sure your power supply can handle that much wattage. Eddie Foy, what you were referring to is serial charging, which is possible too. Parallel charging is generally regarded as safer, though I'm not exactly sure why. With parallel charging, your packs end up at exactly the same voltage, which is important for models that use multiple batteries in parallel. Link to comment Share on other sites More sharing options...
G+_Eddie Foy Posted May 17, 2015 Share Posted May 17, 2015 I don't think one would get 'good' balance charging via parallel charging. The balance leads are seeing the higher voltage of the stronger cell. (ok yes there is a slight differential aspect to it). So if one cell is lower then the other, it will be 'finished' when the higher cell reports done. I don't think its much of a safety issue, but quality. (If a cell has a substantial difference then it's buddy cell, its possible to cause a safety issue.) Link to comment Share on other sites More sharing options...
G+_Nick Whitworth Posted May 17, 2015 Share Posted May 17, 2015 As I understand it, the higher voltage cell will charge up the lower voltage cell, so they end up at the same voltage. When you parallel charge batteries, you want them to be at similar states of charge. So if you flew through one pack, and only got half way through your second pack, you might not want to parallel charge them. Also, always connect the main discharge lead before connecting the balance lead. I made my own parallel charging connector using some deans plugs and some scrap wire. My charger won't charge both at full speed, but it means that I don't have to swap out packs. I usually charge my two packs in parallel, but every so often, I do ballance charges on their own. Link to comment Share on other sites More sharing options...
G+_Kelly Evans Posted May 17, 2015 Share Posted May 17, 2015 here is a video demo on that board that explains it Link to comment Share on other sites More sharing options...
G+_Claude Gregoire Posted May 18, 2015 Author Share Posted May 18, 2015 Thanks everyone for the advice. I think this would be a great one for the show. Link to comment Share on other sites More sharing options...
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