Frustration ends when a dead battery interrupts an important morning or costly replacements become unnecessary. This step-by-step guide reveals how to quickly and easily replace alarm clock batteries ...

For example, the Dallas DS12885 and DS12887 real time clock “chips” were available in a large package with an internal battery. The problem, of course, is that batteries die.

⏰【Battery Operated】Silent alarm clocks, powered by one AA battery (not included), easy to load battery and keeps really good time. Good decoration for home, bedside, desk, table, ...

Atomic Wall Clocks Battery Operated with Alarm - This digital calendar alarm day clock required 3 “AA” long life batteries (Not included) for operation, no redundant wires, easy to use.