Retrocomputing: Replacing a 386/486 CMOS Battery
2024-12-23
Older 386/486 motherboards often have leaky NiCd or NiMH batteries that can damage the board. This guide details a simple alternative: using three AA batteries and a battery holder. The author compares using a CR2032 and a Tadrian 3.6V Lithium cell, ultimately opting for three AAs due to ease of use, no motherboard modification, and the ability to use rechargeable batteries. Other replacement methods are mentioned, including using a CR2032 holder and Schottky diode, and utilizing an external battery header on the motherboard if present.
Hardware
battery replacement