Don't buy!!!! - Integrated backup battery fails

I purchased my first timer in 2013 and just received a fourth warranty replacement. On average, each timer has worked well for slightly more than one year, and then the integrated backup rechargeable battery fails. The battery is supposed to retain the current date and time for about 24 hours when a power outage occurs. But, either the integrated battery or charging circuitry used by Leviton is deficient. Also, the rechargeable battery cannot be removed and replaced. After about one year the current date and time is lost whenever power flickers for just a moment. Leviton seems to acknowledge the problem indirectly as their customer service has never argued when I request a warranty replacement. But, I am getting tired of the annual replacement schedule. I've also read a number of complaints about this issue on Leviton's knowledge base web page. So, it's not just me, and Leviton doesn't appear to be taking any corrective action.

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