To determine whether your charger is UL-certified, flip it over to the inside, and read the label. If you are using a wall charger to charge your calculator, make sure you are using the TI wall charger that came with your calculator or other UL-certified USB charger rated for at least 1 amp (usually written as “1A” or “1000 mA”).Use only rechargeable lithium-ion batteries approved for the handheld/graphing calculator.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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