I just recently used ptouch labels (when I purchased a set a little while ago) and they work better than the marker on battery I had been using.
I mark the them as either roman numerals, letters (A,B,C,D, etc) or numbers. I also put the purchase date on the batteries so I can have an idea how much I have recharged them. (The 2006 batteries are retired, the 2008 are scheduled for retiring now that I have enough replacements.)
As for the chargers themselves, the folding ones work great and have some lights to give you an idea what level they require. (I do recommend having 3 sets of batteries incase your 2nd set is not completely charged when you need to swap them. (I usually am able to recharge a set between 2 hour open filk changes.)
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I mark the them as either roman numerals, letters (A,B,C,D, etc) or numbers. I also put the purchase date on the batteries so I can have an idea how much I have recharged them. (The 2006 batteries are retired, the 2008 are scheduled for retiring now that I have enough replacements.)
As for the chargers themselves, the folding ones work great and have some lights to give you an idea what level they require. (I do recommend having 3 sets of batteries incase your 2nd set is not completely charged when you need to swap them. (I usually am able to recharge a set between 2 hour open filk changes.)