Solution 22950: Battery Type for the TI-10, TI-15 Explorer™ and the TI-108.
What model types of batteries do the TI-10/TI-15 Explorer/TI-108 use?
Both the TI-10 and the TI-15 Elementary calculators use one three volt CR 2025 Lithium Battery. The TI-108 unit is solar powered and does not use a battery to power it.
For the TI-10 and the TI-15 Elementary calculators that use batteries as a source of power, please see a local battery retailer for purchasing details.