I just got a new battery for my BV500 since the old one died. This time I’m replacing it with a Shorai Lithium Ion battery at about 1/6 the weight and twice the cost. For this, I get a battery that’s supposed to be a lot stronger, doesn’t require constant maintenance and lasts twice as long. It’s a fair trade off I suppose. Since it just arrived today, I can’t really make any long term judgment on it just yet. Only time will tell.