Clarius Scanners use a lithium-ion battery which works on ion movement between the positive and negative electrodes. In theory such a mechanism should work forever, but cycling, elevated temperature and aging decrease the performance over time.
To extend battery life, avoid full discharges and charge the battery more often between uses.
Similar to a mechanical device that wears out faster with heavy use, the depth of discharge (DoD) determines the cycle count of the battery. The smaller the discharge (low DoD), the longer the battery will last. Since partial discharge of Lithium Ion batteries is preferred, do plug it in when you’re not using it even if it still holds a charge. Unlike older battery technology, Lithium Ion has no memory and does not need periodic full discharge cycles to prolong life.
A conservative estimate of the lifetime of Lithium Ion batteries is specified as follows: after 400 - 500 discharge/charge life cycles, the battery capacity will be as low as 50% of its original capacity.