Hyperion Charging question - mAh reading after charge

[tc3_racer_001]

when i hit my cutoff for zippy 4800's i can only put around 3300 back in. (3.2v cutoff)

so im not sure how they get their 4800mah rating?

[rootar]

Originally Posted by tc3_racer_001

when i hit my cutoff for zippy 4800's i can only put around 3300 back in. (3.2v cutoff)

so im not sure how they get their 4800mah rating?

huh maybe the zippys arent all that and a bag of chips. because if they rate a pack for 4800 and it only holds 3300-3500mah after you dump it then that in my opinion is a 3500 pack because thats the usable amount of capacity it has right? i know when i dump my protek 5s4000s (20 minute main) they read 15.5 volts going on the charger and hold 4100 mah and 21 volts

so im getting a full 4100 mah of capacity out of my 4000 5s lipos and your getting 3300-3500 mah of capacity out of your 4800s???????? that sounds bad

[JThiessen]

Rootar, I think you are looking at it backwards. My original question was what is the meaning of the mah reading the charger gives at the end of a charge. It was answered that it is the amount that was "put back in", not the total capacitiy of the pack.

[suicideneil]

Originally Posted by rootar

huh maybe the zippys arent all that and a bag of chips. because if they rate a pack for 4800 and it only holds 3300-3500mah after you dump it then that in my opinion is a 3500 pack because thats the usable amount of capacity it has right? i know when i dump my protek 5s4000s (20 minute main) they read 15.5 volts going on the charger and hold 4100 mah and 21 volts

so im getting a full 4100 mah of capacity out of my 4000 5s lipos and your getting 3300-3500 mah of capacity out of your 4800s???????? that sounds bad

That logic is somewhat flawed; if you were to drain a lipo down to 0amps, then recharge it back upto 4.2v, it would more than likely say on the charger that you have pumped in the full rated capcity. Saddly your lipos would also be dead as you cant discharge then down below about 2.6v per cell; that is where you are 'loosing' some of total capacity- there is a difference between rated mah and usable mah quantities.

With my 2300mah A123 packs, I usually pump back in about 2000mah (I run them in the truck till they dump). With my 4000mah lipos, I usally put about 3000mah back into them- you cant drain a battery and refill it like a nitro fuel tank, you have to leave some energy in there to prevent the voltage from dropping too low and killing the pack.

I'd love to explain the difference observed between the Protech and Zippy lipos, but the only thing I can think of is that the Protechs actually hold somewhat more mah than they are rated at, and that the LVC is set a bit high for the Zippies...