The dirty little secret about the ThinkPad T430's CMOS battery : Global Nerdy
Is this battery swollen? : r/thinkpad
Flex-3-1580-Battery-Charging-Power-Issue - English Community - LENOVO COMMUNITY
IBM ThinkPad 2655-27A ThinkPad 560X Thinkpad 570 T Replacement Battery: BatteryClerk.com CMOS Backup
Found a T500 in my "Lithium Battery Donations" box. Good physical shape (needs a deep cleaning). Looks like a SIM slot too? Is this worth restoring for the kids' ChromeOS Flex machine?