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Is it an old battery? Maybe you should replace it with a new one. The new ones stay charged. You can make sure you don't use the battery charge up. Keep the light switches off. At night be sure everything is shut off.

 

[grace]

The battery advice is good. Keep the switch Off when you don't need it. We have a calculator that has solar power and battery power. It uses both and we really like it. Then you have another way to power it.