![]() Do not leave the handheld/graphing calculator connected to a charging device for longer than 3 days. ![]() If you do not use the handheld/graphing calculator regularly, fully recharge the battery at least once per month.Avoid waiting until it is fully discharged. If you use the handheld/graphing calculator regularly, recharge the battery often.When properly maintained and under normal usage, batteries are expected to last about 3 years. As lithium-ion batteries age, they lose capacity.Keeping handhelds/graphing calculators in a cool, dry place as close to room temperature as possible is ideal.High humidity environments should be avoided.Heat can reduce lithium-ion battery life.Batteries are designed to operate optimally at room temperature.To extend battery lifespan and battery life, we recommend following these simple guidelines: Lithium-ion batteries have a limited life, which is affected by several factors: environment, storage, the number of charge/discharge cycles, and level of discharge/charge. Lithium-Ion Battery Routine Maintenance and Care for TI Graphing Calculators
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