Wow, that looks like a bargain, nice case, spare battery, and a good brand (for other tools). Too bad I don’t already have Sata battery tools - trying to keep a limit on my number of battery platforms. Anybody know if these batteries interchange with anything else? Sata didn’t even list battery tools on their web site so I assume they’re OEM from someone else, but I don’t immediately recognize the connector. Interestingly, it looks like there might be enough contacts there to charge each cell individually (balance charge), suggesting the protection is in the tool/charger not the battery.