M12 12-Volt 1.5 Ah Lithium-Ion Compact Battery Pack (2-Pack)

Grabbed these for the clearance price and they fit every M12 tool I've got, from the drill to the radio. The charge indicator on the pack is a nice touch, so I always know when to swap.

These have been running my impact driver all day without any noticeable power drop, which is exactly what I needed for a heavy trim-out job. The compact size makes them easy to pop into tight spots behind cabinets too.

I needed a couple more batteries for my M12 tools, and these 1.5 Ah packs fit perfectly in the compact drill. They charge fast and hold up well under light to moderate use.