New batteries for Hasselblad 500 EL/M

Today I got two new Exell NH-5 6.0 volt 800 mAh rechargeable NiMH batteries for my Hasselblad 500 EL/M. They fit and work great. Only thing is that there is no information about them. Don't know how long to charge them. (Plugged them up to the DIN charger, but they had a charge in them when I unpacked them.) They cost $33 each but if they work out, it will be worth it. They are way lighter than the original batteries. All one piece construction with a black plastic covering. If anyone knows anything about these batteries, please chime in.

Standard dumb charge rate is C/10 (80mA) for 13-15 hours, MAX 15 hours.

Optional. Then drop to trickle of C/20 (40ma) or less.