There are two batteries inside the Tandy 600. One is the main battery that operates the computer and all its built in peripherals when you press the Power button. The second is a little battery that maintains the RAM when the computer is off.
Both of these batteries are rechargeable, and both will eventually need to be replaced. Attaching the computer to the AC adapter for 14 hours recharges the main battery. The memory battery probably recharges as long as the AC is attached.
(The manual doesn't say.) You know the main battery is dead when the computer won't hold a charge anymore. You know the memory battery is dead when you disconnect the AC, have the Memory Power switch on the bottom on, wait a few hours, connect the AC, and have to cold start the 600 because the memory has been wiped. More.
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