HP · Calculators

HP 12C Platinum battery

2 × 3V lithium coin cell

How to replace it

Notes	Replace carefully; continuous memory models — change one cell at a time when instructed
Access	Tool-free

Last checked 7 October 2026

HP 12C Platinum uses 2 × CR2032.

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

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Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
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Klein Tools MM400 Multimeter
General DC voltage checks including battery terminals
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Digital multimeter
Measure open-circuit voltage and general electronics checks
Voltage alone does not establish usable capacity, especially for rechargeables.
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Buy links are optional and separate from the battery answer.

A fresh 2 × CR2032 should restore HP 12C Platinum if the battery was the problem. Work through the checks below before replacing the device.

Check the battery type
This device needs 2 × CR2032 (lithium). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
Check known model-specific issues
Treat Platinum as its own record from classic 12C
Confirm the battery itself
For most coin cells, fitting a known-good fresh cell of the correct code is simpler than capacity testing.
Still not responding?
If a correct, fresh battery installed properly does not restore the device, the fault may be elsewhere — the device may need service or replacement.

These checks follow this device’s orientation, battery type, and important notes from the maker.