BAT41 Lithium-Ion Battery (p/n 104034).
There is no absolute answer for how long a Lithium-Ion battery will last. Aging of Lithium-Ion batteries is affected in several ways: age, use, charge-cycle and storage conditions. With moderate use, the life expectancy is typically 2 to 3 years and around 300 to 500 charges. Under the most ideal conditions, over 1000 cycles can be achieved.
Age - From the first day of their manufacture, Lithium-Ion batteries naturally lose capacity through cell oxidation which results in increased internal resistance further resulting in decreased capacity
Use – High current requirements increase the oxidation process.
Charge-Cycle – Deeper discharges increase the oxidation process.
Storage – Hotter storage temperatures increase the oxidation process.
Extreme conditions therefore increase the rate of oxidation limiting the useful life of a Lithium-Ion battery. An aged battery can be kept longer in applications that draw low current as opposed to a function that demands heavy loads. Lithium-Ion batteries prefer a partial rather than a full discharge. Lithium-Ion batteries don’t have memory problems like Nickel-Cadmium batteries. Manufacturers recommend that Lithium-Ion batteries be stored at 15⁰C (59⁰F) at a charge of 40%. The worst condition for a Lithium-Ion battery is to store it fully charged at a high temperature (above ~40⁰C) .
NOTE: BAT41 batteries do not support fuel gauges and therefore do not require to be deep cycled in order to calibrate for “digital memory”.