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Texas Instruments' Graphing Calculators have evolved over the years to be rechargeable and have a backlit screen. With these feature improvements, regular AAA batteries were no longer going to cut it. TI switched to using rechargeable lithium-ion batteries.
There are two types Texas Instruments Rechargeable Graphing Calculator Batteries.
One with a wire (or pigtail) and one without the wire (or pigtail).
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