Texas Instruments TI-34 II Explorer Plus battery

1 × 3V lithium coin cell

How to replace it

Follow the manufacturer steps in the sources below.

Last checked 7 October 2026

Texas Instruments TI-34 II Explorer Plus uses 1 × CR2025.

Buy links go to Amazon (Associates where tagged) or other affiliate programmes when available. They never change the battery answer.

Optional tools for opening, testing or charging — separate from the battery answer.

Amazon links may earn us a commission. They do not change the battery answer.

Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
Docs Buy on Amazon More tools
Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
Docs Buy on Amazon More tools

Digital multimeter
Measure open-circuit voltage and general electronics checks
Voltage alone does not establish usable capacity, especially for rechargeables.
Tester vs multimeter Buy on Amazon

Buy links are optional and separate from the battery answer.