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  1. Steve Crooks, it claims to use a lithium battery, but I see evidence that it’s actually lead acid. It’s much heavier than the Greenworks lithium mowers; there are comments by amazon customers claiming it’s lead acid; and the replacement battery on walmart.com (http://www.walmart.com/ip/30224762) says lead acid. I want to buy one for my mom, but 90 pounds is too heavy.

  2. Yeah it’s weird. You’re supposed to keep it plugged in all winter which sounds like lead acid to me. But it says really big on top lithium ion. Truth be told I don’t really care: it works. As for 90 pounds, that’s hard to believe. There may indeed be other brands that are better in some way, black & decker is the only one I’ve ever used. Maybe when this one wears out… I just know that I’ll always stick with battery power.