Bosch GLM 100 Replacement Battery 3.7V 1200mAh Li-ion

Bosch GLM 100 Series — 3.7V Li-ion Replacement Battery (2 609 169 034)

This 3.7V, 1200mAh Li-ion cell replaces the rechargeable battery in the Bosch GLM 100 laser distance meter. It fits the GLM 100 and associated model numbers including 3601K723B0, 3601K72300, and 3601K72370. Slim-profile dimensions of 53.60 × 33.80 × 6.40mm match the original battery bay exactly.

• GLM 100 platform fit: These GLM 100 variants share the same battery bay geometry, 3.7V supply rail, and connector pinout. One battery covers the full listed model range without modification.
• Bench tested on actual hardware: We cycled this cell through the GLM 100's measurement and display draw profile. The BMS held steady across repeated burst draws at laser trigger events and maintained stable output voltage through the full discharge curve.
• First-install calibration step: After fitting this battery, run a full calibration cycle through the GLM 100's instrument menu before taking it to site. The meter maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session in the field.

GLM 100 shutting down mid-measurement despite a charged battery

The GLM 100 fires the laser and drives the display simultaneously — that combined draw creates a brief current spike at the moment of measurement. If the cell has degraded internal resistance, voltage sags enough during that spike to trip the BMS undervoltage cutoff, even when the indicator shows a partial charge. A new cell with lower internal resistance handles the spike without dropping below the cutoff threshold. If shutdowns persist after fitting a replacement, check that the battery contacts in the bay are clean and making full contact.

GLM 100 not powering on after sitting unused for several months

Li-ion cells self-discharge during storage. If the GLM 100 sat unused long enough, the cell voltage drops below the BMS recovery threshold — typically around 2.5V — and the protection circuit locks out to prevent damage. The meter will show no response at all, which looks like a dead instrument rather than a flat battery. Place the battery on a compatible charger and allow a slow trickle charge to bring the cell voltage back above the recovery threshold before attempting to power on the meter.