Charging

[mailman35]

ive done some searching and either im being blind or just not seeing the data, but i have several packs, and looking for the ideal charge rate, im using a thunderpower TP610C-ACDC
i do have a thunder power 3s g6 battery(2700mah) which can charge at 5c it says 13.5amp(charger doesnt go that high though)
i also have 2 2650mah turingy 3s and from what i can tell to charge at 2c, i need to configure the charger to charge at 5.6amp (2.65 x 2 )

so i think i might understand it after typing this all out, just looking for some verification of my math? or some better best practices, i do have a lipo charging bag as well.

thanks in advance

mark

 

[Arxangel]

Just charge both packs at around 4-4.3amp, you will be fine and it will still be under an hour.

Cheers
Nikola

 

[DucktileMedia]

I heard from one source that you can charge at the amps it outputs per hour. So 5500mah would charge at up to 5.5 amps. Another source said anything over 3 amps is kinda risky for the longevity of your cells. I dont know which way to go but I was charging my 5500mah 3s 25c's at 5amps for a quite a while with no issues. hmmmm...

 

[Arxangel]

I heard from one source that you can charge at the amps it outputs per hour. So 5500mah would charge at up to 5.5 amps. Another source said anything over 3 amps is kinda risky for the longevity of your cells. I dont know which way to go but I was charging my 5500mah 3s 25c's at 5amps for a quite a while with no issues. hmmmm...

What you read is largely true for NiMh and NiCd batteries. Li-Pos can take more punishment without reducing their life. I charge a 2s 5000mah Li-Po at 7amps, and it doesn't even get hot, and this is the cheapest Chinese battery. I have Turnigy's and LRP's that I charge at double their capacity and they remain relatively cool during charging.

 

[kloner]

if you have a 2700 mah lipo, charging it at 1c would be 2.7 amp charge rate no matter what anything else about the battery is. same battery at 5c is 13.5 amp charge rate.

the 610 charger is a 250 watt, if you have an ideal power supply you might get over 8-10 amps on a 3s battery, but i doubt it. Have had a 1kw charger with 1500 watt power supplies so long i forgot the nitty gritty on the 250's but in 3s under 3000 mah isn't bad. You get a box full of 6s 3000-5000 mah or more and your wishin you got a bigger charger

You won't feel any heat with lipos from over charging, you'll feel it from charging it in the wrong mode. you'll get heat from over discharge. Any heat you feel in a lipo is bad, not suppose to happen. Warm every flight means you either don't have enough amperage to supply the craft or you drained it to far, either results in a quickly rising internal resistance which in turn makes it hold less and output goes way down quick. Some battery checkers have a little IR on it so you know whats the problem and can watch yourself screw em up. nice chargers also have it...... i use iChargers 306b and a pair of 750 watt dell server power supplies wired in series for 24volt output, got around 40-50 packs i take care of, parralel charging board to charge 6 at a time, the works

 

[mailman35]

kkloner,
good to know, liek i said i think i got the numbers right for charging at 1c and 2c i was looking for verification as well as making sure i wasnt doing anything wrong i like the decreased charge time thus far.
as far as draining the lipo's go i have the quad set to land when it gets to about 24% remaining, so im leaving a buffer before i get to the 20% mark.

mark