charge

I have two old Japanese motorcycles and recently I have been struck with bad battery luck. I have had them hooked up to battery tenders (trickle chargers) for days on end to keep the battery fresh. Well I just started noticing that the batteries are boiling...or at least thats how they sound...

I just brought my bike out for the first time in 2009, and the battery was flat so I got a boost from my car. When I arrived at work, 41km (25.5mi) later, I found the battery still quite flat. I had the impression that 41km on the highway should have given the battery plenty of charge. Is that...