Utilitec timers do not have replaceable batteries.http://waterheatertimer.org/Program-wire-Utilitec-0192773.htmlhttp://waterheatertimer.org/Program-wire-Utilitec-LW60418.html
Older timer designs have batteries, while more modern timers have internal rechargeable battery that is integral with circuit board, and cannot be replaced. The battery holds memories in event of power outage, but current time must be reset if power is out for extended time.
If you have continual problems with failed timers, then have electrician friend run test on your power for spikes, shortages and surge that will cause timers and other non-hardened electronics to fail frequently. Also check for polarity and grounding issues. Also if you have motors, other electronics and/or fluorescent lights on same circuit, this can cause interference.
Also check load limitations, and load on timer to make sure you are not exceeding the timer rating. For example using timer to control motor when timer is rated for non-inductive incandescent loads.
Reset timer using reset button, and then re-program. Buy another timer at Lowes and return defect in new package for refund.
Buy Intermatic ST01C timer. This timer uses CR2 battery, and timer electronics operate separately from electric line. Rated for any load: motors, cfl bulbs, led, incandescent, etc.http://waterheatertimer.org/ST01C-program.html
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