Thanks Eye, not sure what HD means, but it sounds like one 9 in your book would be better thaN 2 5s.
Heavy duty. HD-high out put.
I run a hilti drill and I use 5ah batteries and I can go through 2 of them on a real busy moving day. I have 6 or 8 batteries total so I don’t bother buying a 8ah battery, if I had a choice between the 9 or 2 5s I’d try the 9 and have a 5 as back up. It sucks walking back to the shack for a battery swap. But isn’t a big deal at all.
The 12ah HD high output can be bought for 250 bucks. Hurts a bit but will be a awesome battery to drill with. You will see a huge power difference in this battery as well. The milwaukee will not be able to be stopped paired with a lite flight.
Makes you realize a 40v strikemaster would have been cheaper