Thanks bhady. I called Tower and the lady on the phone said the wall wart wouldn't work. I have a tail light bulb and some extra leads and can make a discharge set up. The pack is a 4.8volt 750ma and I am guessing I should charge it for 15 hours at 50ma. I have a hobbico charger that will select from 10ma thru 500ma. Would that be a better choice? It doesn't cycle batteries, just charges them.
Thanks for your help. I don't know much about electronic stuff.