Once a day for IB3800?

[RC-Monster Mike]

All nimh packs are sensitive to over usage. The 3800s can be charged more than once a day as long as ample time is allowed for them to cool. If they are used excessively, the life will be shortened. This is the case with all nimh batteries. The 3800s are perhaps a touch more sensitive to this than the gp3700s, but running them twice a day with a cooling off period is perfectly acceptable. They will usually run a little stronger on the second charge, actually. I would keep the batteries out of the fridge, too. A fan or something will help cooling, but it isn't as good idea to try to cool them too fast, either(as metalman already mentioned, the batteries need to cool completely and thoroughly).