Originally Posted by
targetingxmod
Well if the baterys says it can be charged in 2c or 3c or 5c that is no problem.
1c is the actuall mahs of the batery. 2c is the double of the mahs of the batery.
A double C means half the time to charge.
Minium 100w charger for you if want to charge at 1c, that is more then an hour....
if you want to charge in 20minutes you need a 400w or even higher charger!
Those numbers only match for your 5s, not the 2s the OP asked about
:
1C always takes about 1 hour. (Ok, when balancing it may take a little longer).
And for 2s you certainly don't need 100W for 1C. Since 8.4V (fully charged, no load voltage)*5A (=1C for a 5000mAh battery) is just 42 Watts... so a 50W or 60W unit should be enough.
To charge in 20 minutes instead of 1 hour, you'd need 3C (15A), since 20 minutes is one third of an hour. And for that 8.4V*15A=126W is all you'd need (plus a little reserve) - but you don't need 400W - not even close to that.
Only when you charge 5s instead of 2s, those numbers become true - but again: the OP asked about 2s, not the 5s you use.
Originally Posted by
targetingxmod
I charge my 5s (18.5V) lipo with a 50w AC/DC charger, and select 5.0A...but the charger only charges at 2.5A and gets extremelly hot...so i need a new charger to charger faster and cooler! :P
Of course. Fully charged, no load, a 5s has 21V... so a charger with 50W can only charge at 2.38A (=50W/21V)... about the 2.5 Ayou said. Setting it to 5.0A cannot work, you'd need 105W (plus a little reserve) for that at least. And it gets hot, because it is at its absolute limit!