Imax B6ac - Nimh charging
So i have a couple of older 5 cell hump packs for my nitro cars im trying to revive. The problem im running into with them is charging them correctly. Ive charged them at .1 amp for a long slow charge and after a 2 or 300 mah they kick off and say full. Ive tried .1, .2, 1amp, 2amp and 5amp. On 5 amp i got 1 pack to charge but the battery was super hot. Its a 1400mah pack and took a little over 1500mah before i shut it off. This was running a fan on them to keep them from probably exploding they were so hot. So hot the heat shrink was tacky. Well to my surprise that pack seems to be working decent. I ran at least 1.5 hours on it on my savage x and its working fine. The other pack is a venom 1600mah and even on 5amp it only takes about 275 mah into it. When i try to discharge either one of them with the charger @ 1amp 1 cell will go almost completely dead (.11 volts) and the rest hover about 1.2-1.25v per cell. I just dont understand it. I know charging @ 5amps is horrible on these batteries but its the only way i can get them to take any charge at all. Anything lower will only put a 200-300 mah into the pack.
On the 1600mah pack ive seen voltages @ 5amps of up to 14v+.....Whereas the 1400mah dynamite pack peaked voltage when charging around 8volts @ 5amps. To me this is way too much even on the 1400mah pack considering its a 6v pack. Im guessing both packs are probably bad and im doing nothing more but forcing amperage at them to try to get them to take more mah into the pack. If i were to shut them down at about 120 degrees when nimhs are said to be fully charged i would probably only have about 600-800mah packs, correct? These packs sat over a year dead inside my house and were dead when i got them used. I never really used them so its hard telling the condition.
Edit* Alot of times when trying to charge the batteries at low amperage .1 amps it will say "Connection break" and shut off. If i bump it up some it will start charging.