I also can’t tell you what changes or improvements have been made to the current 4Ah batteries, if any, as I don’t have any recent 4Ah batteries to examine. Unfortunately, I don’t have enough of a range of batteries to be able to pinpoint when any of the major or minor M18 XC design changes were implemented. There are some common features, but the M18 XC battery design looks to have been largely redesigned for the launch of the 5Ah battery, or at least between 4Ah and 5Ah releases. I found this to be the most interesting difference, but it’s also clear that Milwaukee implemented many significant changes when developing their 5Ah battery. The more recent batteries also look to have thick custom terminals soldered straight to the circuit board, while the oldest battery has still-beefy terminals but with short wires connecting them to the circuit board. Perhaps the tool connection interface was redesigned for better moisture and corrosion protection on the higher capacity HD battery, and then the changes were made to XC batteries as well. The batteries I have that pre-date that enhanced warning, which relates to avoiding exposure to conductive or corrosive liquids that can get inside HD 9Ah batteries, had an application of power terminal grease, and batteries from 2018 and later – at the least those I checked – do not have any grease. Milwaukee issued expanded warnings about their M18 HD 9Ah battery back in mid-2017. I contacted Milwaukee about when the change happened and why, and will report back if I learn anything, although given the nature of the question I can’t expect to receive too many official details. There are no battery codes – I’m going by the date codes of the injection molding.
I examined a couple of batteries and peeked inside 3 of them – an M18 4Ah battery from ~2012, a 5Ah battery from 2014, and a 5ah battery from 2018. Why would older batteries have grease within the battery contacts, but not the newer ones? My guess is that it’s some kind of dielectric or conductive grease for moisture and corrosion resistance.īut, I looked at some other M18 batteries – newer ones – and they didn’t have any such grease. Okay, so that’s interesting – there’s some kind of grease within the power terminals.
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