Logitech · Computer peripherals

Logitech M185 Wireless Mouse battery

1 × 1.5V alkaline cell

Printed IDs: M-R0038 (M/N) · M-R0061 (M/N) · M-R0084 (M/N) · M-R0078 (M/N) · M-R0085 (M/N) · MR0102 (M/N)

Based on: Logitech documentation
Last checked: 7 October 2026
Size: 14.5 × 50.5 mm
Voltage: 1.5 V
Manufacturer estimate: Up to ~12 months — Manufacturer estimate — not a guarantee
Rechargeable: Conditional — check chemistry notes

How to replace it

How to open	Slide off the underside compartment cover. Insert one AA alkaline battery observing polarity diagram. Replace cover. USB receiver often stores in the same compartment.
Orientation	Observe polarity marks in compartment
Notes	Confirm hardware ID on underside label (M/N). Multiple M185/M186 tooling variants (M-R0038, M-R0061, M-R0084, M-R0078, M-R0085, MR0102) share 1× AA.
Access	Tool-free

Last checked 7 October 2026

Logitech M185 Wireless Mouse uses 1 × AA.

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

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Panasonic eneloop AA (LSD NiMH)
Replacement AA cells when the device accepts NiMH
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Panasonic eneloop BQ-CC55 charger
Everyday NiMH AA/AAA charging (eneloop ecosystem)
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Battery tester
Quick good / low / dead check for household cells
Crude check only — does not measure capacity under realistic load.
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A fresh 1 × AA should restore Logitech M185 Wireless Mouse if the battery was the problem. Work through the checks below before replacing the device.

Check orientation
Confirm the cell is seated correctly: Observe polarity marks in compartment
Check the battery type
This device needs 1 × AA (alkaline). Rechargeable cells are only suitable when the manufacturer accepts that chemistry — set battery type in device settings if available. Same size does not always mean the same battery.
Check known model-specific issues
Identify by underside M/N — marketing name M185 covers several hardware IDs. Logitech recommends alkaline AA; non-alkaline (NiMH/NiCd) may shorten life.
Confirm the battery itself
If you have a battery tester or multimeter, check the cell. A low open-circuit voltage often means replace; for rechargeable AA/AAA, a capacity test is more informative than voltage alone.
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.