Jeff W
Updated at 2022-06-07 13:44:06 UTC
When I took mine out of 5 months of storage I did it a few weeks before I was going to set up my plants and irrigation system and just stuck them (I have 5) in the sunniest spots for a while and they recharged themselves. You may need to do the same. I'd give it a good full day of direct sun and see if that helps anything. 
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