Thanks Ed. Yeah, I have the Milwaukee 16" chainsaw, but I think there is a replacement 18" bar for it as an upgrade. The battery is on the M18 platform and is an HD12.0 (12A-h battery). The battery is a beast, but it is well balanced in the chainsaw and overall it weighs less than a comparable gas chainsaw. The battery retails for like $250 though you can often find it for $200. I don't have a lot of yard work to do, but on my property this chainsaw is more than enough. In reviews I watched at the time, the Milwaukee chainsaw did nearly as good as a similar sized gas equivalent, but of course depending on the type of test in the review sometimes the gas won the test. I haven't looked in a year or two, but I think the DeWalt chainsaw gets better reviews than the Milwaukee. Bottomline is cordless chainsaws have come along way due to the new battery technology available with brushless motors. Nicest thing with a cordless chainsaw is they fire up everytime, no choke to worry about, no gas to mix, much quieter, nearly no maintenance, etc., etc. There is a new Milwaukee push mower that uses two of those HD12.0 batteries. It is $1000 for the 2 required batteries, charger and mower!!! I bought that battery for dual use, but honestly I don't have any tools that really need a 12A-h battery. It is a lot of weight to carry around on an impact driver, drill, etc. I do share batteries on my leaf blower and 6" pruning saw with my shop equipment though so it has been well worth it IMHO.
I agree, the world would be a much better place if the tools were battery agnostic. I would have less heartburn going with a cordless tool platform if I knew that battery replacements in the future were readily accessible and/or newer batteries could be retrofitted easily into my older platform.