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Originally Posted by DAVES
The batteries are expensive. They do have a time life, likely around seven years. Also, there is stand by losses. Simple solution is to number the batteries and rotate them.
Assuming they are lithium ion it will say expected recharge cycles. No one counts them but, you get far more charge cycles if you do not drain the battery far down. You should recharge them after each use not wait till the next time you want to use the tool.
Heat, as in your garage is also bad for batteries.
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Lithium batteries are computer controlled they stop long before the are close to dead. I have. 56V batteries and they stop at 41Vs. IMO problem with ion don’t over heat them. Rotate them so they have time to cool down before charging. Charging crates heat also.