If the battery is left in a low charge condition for a period of time the battery will no longer take a charge and your pitching machine will slow down or stop all together. To achieve maximum battery life it is recommended that the battery never be left in a low charge condition. It not harmful to the battery to run the pitching machine until you are out of power, but it is extremely important to overall battery life to give it a good over night charge within two days after a full battery discharge. If you store your machine for an extended period of time (2 months or more) you must fully charge the battery (8 - 16 hours) before storage. Also, to maximize battery life, you should give the machine a full charge about every 2 months, again, similar to a car battery.Caution: Only use the charger provided with your machine. Always store indoors, never expose to weatherAny questions, contact us here: https://contact.maxbp.com/