Can I add 2 3s Lipo packs to my setup?

[transposon]

I am building my first ebike. I purchased a pair of Multi Star 6s 10Ah Lipos for my 1000W 48V conversion kit. I am considering increasing the volts for a little more pep.

HK has 3s 5Ah packs. Could I place two of these in parallel and then connect them in series with each of the 6s packs?

(3s + 3s in parallel) + 6s + 6s for the equivalent of a 15s 10Ah pack? The 6s packs are about 1.5 years old, but only have about 2 cycles on them and have been stored at storage voltage for virtually the entire time. I plan on having low voltage alarms on the balance leads for each pack.

Does this sound safe? I plan on charging all packs to 4.1V/cell so I should be under the 63V cutoff for my controller.

Thanks

 

[john61ct]

Really best if all the components match, age as well as cell model and xPyS layout.

48V is 13S
14S is usually called 52V

I guess 15S could be called 54 or 55V, charge at 61-2V would be better for longevity.

Sure that's what you want, are you trying to get an extra 1.5km/hr or something?

not pushing your kit too hard?

What do you mean by charging through the controller?

Personally I'd build a pair of 7S packs, serial for use but split to charge with a balance charger.