If you can't get in more than 3000mah to your 33k GPs chances
are they're tired. Steps to follow to bring back to almost new
step 1: fully discharge to .85v/cell
step 2: tray them until lights go out
step 3: short the cells individually (not using a tray cuz some
of them have resistors and diodes that have auto
cut off.) for 30 min. to an hour ( batts will just get warm
and not hot) and let batts cool
step 4: As batts are cool individually zapp the cells several
times per cell using a hi volt zapper (200v+)
step 5: Charge battery (as a pack) using you normal procedure
then discharge at pref. at 20-30amps and your batts
are close to new. (it may false peak on 1st charge)
note: If you dont zapp them ave. volts will not improve.
The older and newer (as of February) GP3300s like to be discharged all the way down, put on an Integy or trinity discharge tray, and dead shorted.
I just bring mine down on 15 light bulbs, then one light bulb to finish it off. The I take a piece of wire and solder it to each of the battery bars to deadshort the pack.
This drops your IR and adds keeps the voltage, at the expense of runtime...Good for stock racing of 4 minute races.
Charge at as high as 7 amps, with your pack on a heating pad. Keep the pack on the heat pad until you put the pack in your car. This adds voltage to the pack, with no noticable loss in runtine. No change in IR from what ive seen.