Charging sub-C NiCd in series question

Batteries and Chargers Rechargeable Batteries
1

Hi, folks. Been lurking here for years and this is my first post. Apologies if I’m rehashing an old topic, but I just want to be sure. Ran a search but couldn’t come to a conclusion about my doubt, so would appreciate answers.

I’m trying to charge 3 sub-C 1900mAh nickel cadmiums in series (it’s a prebuilt battery pack) with a dumb 400mA 4.5v charger. Because the batteries were unused for years, I’ve run them down to nearly 0v and am considering shorting them overnight. My question is, how long should I leave them on charge for? Would it help charging them with 6v at 400mA?

Thanks!

2

charge at .1c thats 10% of capacity.
or 190 ma for 16 hours.dont short them as you may reverse a cell and do damage.
sitting idle for years means they need a few full cycles to “wake up”

3

Ah, thanks for the reply, snakebite. Thought one had to add up the three 1900mAh and then do 0.1C for 16 hours. So in this case 8 hours sounds perfect, correct?