I discovered my original 5-amp batteries were bad first trip out this winter. Got 4 seasons out of them. Last trip out last year, I ran them pretty hard overheated both. Didn’t think much of it, recharged them when I got home. Topped them off over the summer. First trip out this year pistol bit would turn but no power, like the battery was going dead but it showed full power. Swapped battery out, same thing with battery two. Barely got 3 holes in 5 inches of ice. Tried a buddies brand new 6-amp battery and it was fine. Bought 2 new 6-amp batteries had have probably ripped 1000 holes this season, no problem. Batteries go bad.

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