-
The dewalt 60/20v batteries can be used on both 60v and 20v tools. They have one that comes in a 9.0 amp hour size. I don't have one personally but we have them at work and they run for a very very long time. Definitely an expensive option for a homeowner but they sure do work nice.
-
Unless you have a weak battery or drill that is burnt out, most drilling problems are the drill bit.
-
I've used DeWalt 18V for years, tried others, always went back to DeWalt. I now have DeWalt 20V. I have a cople of 2AH, some 4AH and 4 @ 6AH. I like the weight of the 2's best.
When using, be sure to have a sharp TAPPING bit, not something in a bit kit or from a hdwe store. Then as the drill shows signs of slowing, change the battery. Especially on the Lithium batteries, they go from good to dead very quickly, but while good they last far longer, it just at the end of charge where they go quickly to dead.
-
I will add that I am using a 1 year old Canadian tapping bit.