Braille was great for two years than crapped out hard, from start to no go seemed like overnight, both of them. I was in a pinch and neede a battery instantly, found the grey case Duracell (Deka) at batteries plus, bike was up and running within an hour of needling one, hard to beat a two year replacement warranty(normal wear and tear)and availability across the states if needed, unfortunately(or fortunately) for me they both outlasted the warranty, Im going to go with again, just didn’t know the diff between zinc or lead terminals if any. I see the zinc has better conductivity and little to no corrosion, which I’ve never had a problem with either, my batteries don’t have time to corrode, they shit the bed first. My bike is older, before the crappy ECH’s, so, haven’t had a problem there either.