Updated at 2021-05-28 22:24:14 UTC
I've only had my system for two years, but I have 4 whisperers throughout the yard. I've only had to have one replaced, rma throu Netro. I just leave mine in the yard throughout the winter. This keeps them charged, for the most part, and they're ready to go for the following season come spring. 
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Ken Wiens
2021-05-30 00:39:45 UTC  
I'm a little reluctant to leave them out in the winter. I'm in Calgary (Canada) and we will get periods of -30C and lots of snow. That's a bit much for most batteries