Kobalt stated in a previous reply, "Batteries can be left on the charger for up to 30 days." Question: What happens after 30 days to those batteries

Dear Valued Lowe's Customer, This is an excellent question, thank you! Once the battery is fully charged, charging stops. If the battery voltage drops significantly after many months, which is unlikely put possible and not harmful to the battery. The charger will not automatically recharge the battery, unless the battery is manually removed and re-plugged on the charger. Therefore it is safe to leave the battery on the charger and it does no harm to removes it after charging. We hope this information finds you well, and thank you for your interest in our products. -Customer Support