Hi Jerry,
We're glad to help! The mAh describes the energy charge of a battery. A battery with a higher mAh will hold a charge longer than a battery with a lower mAh. Most of the time, a battery with a higher mAh will be larger than a battery with a smaller mAh, so you will want to weigh the battery life vs the size of a given battery to determine which will work best for you.
Best regards,
Brad