The “ce3125” is just a TYCO TE 1488991-1 copy with like 20-30x markup. Same family (MCON 1.2) as the brown connectorI posted prior. I’m almost certain the OP has 4-2098541-1, which has a brown body and blue inner seal.
There’s also the 4-x variants of both connectors, which have a primary...
I already had prior to asking. Moisture pre-primer, and/or during paint application would have compounded the corrosion issue, they’re not mutually exclusive.
I’ve had their brushed impact driver/drill/angle grinder for ~eight years now, they’re beat to hell and back but still function fine. Replaced with the brushless versions last year, which I also have no complaints about. 🤷♂️
That being said, the 1.5ah batteries are gutless for anything but...
For what it's worth.....Consumer Reports scored it very highly in their testing (86/100, only two points behind the Honda eu3000is) and called it a "Best Buy".