those battery powered drills are real convenient. unfortunately, when the battery fails, it drives me nuts. after tossing some of those drills, after a couple of years with bad batts, i stick with corded ones, as they last 20 years or so.
I have a Makita xlt something 18v drill , probly had it 20+ years, always immediately charged a flat (3ah) battery . Never really used the hammer action thing and then only in mortar . Used it to install ac for 5 years at work . Apart from that I have done nothing in the way of maintenance and its still going like it was new .
Also have a 14v makita drill....same age ,the motor crapped out almost straight away ( smoked the fields )replaced motor and still going. I had to replace both nmhi batteries ....maybe 2 years ago .
Now just to say .......I ran a service dept and a one point I bought 2 Dewalt suitcase kits for my tradies ,drills ,saws ....5 or 6 different tools ,cost me a couple of grand each . They had not long come into the NZ market ........and they were crap . I mean like if you supply tools to tradies they are not going to treat them as their own but even so . They didnt actually break but stuff stopped working properly and they just seemed to wear out real fast .
Ill stick with my Makita .......ya sorta get trapped coz all my batteries are Makita so when I want a new thing .....grinder or skill saw , I buy a Makita skin and used the charging system I already have .
I did have to buy 9ah batteries for the grinder and skillsaw as my original 3ah batteries didnt have enough grunt .....specially for the grinder .....saw was marginal on 3ah .
