Kanomax 3910 Anemometer Replacement Battery 11.1V 7800mAh

Kanomax 3910 Anemometer — 11.1V Li-ion Replacement Battery (3910-12)

This is a 11.1V, 7800mAh Li-ion battery pack for the Kanomax 3910 handheld anemometer. It fits the 3910 series directly, using the original OEM part number 3910-12. The 3910 is a portable wind speed and air flow measurement instrument used in HVAC commissioning, environmental surveys, and industrial ventilation assessments.

• Kanomax 3910 platform fit: The 3910 runs its probe circuitry and display from a single 11.1V three-cell Li-ion pack. The connector pinout and BMS communication protocol are specific to this platform — swapping to a generic pack with a mismatched BMS profile causes the instrument to reject the battery or report false charge states.
• Bench tested on actual hardware: We ran this pack through probe initialisation cycles and sustained logging loads on the 3910. The BMS held the rail steady through the current spike at sensor power-up and did not trip during continuous measurement sessions under full probe load.
• Post-install calibration cycle: After fitting this battery, run a full calibration cycle through the instrument menu before field deployment. The 3910 maps battery state during calibration — skipping this step causes premature low-battery warnings on the first measurement session, even with a fully charged pack.

BMS lockout after the Kanomax 3910 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If the 3910 sits unused long enough, cell voltage drops below the BMS recovery threshold — typically around 2.5V per cell. At that point the BMS enters a protective sleep state and the instrument will not power on, even when connected to a charger. To recover, apply a slow pre-charge using a compatible Li-ion charger that supports recovery mode, then hold the charge until the pack reaches at least 10.5V total before attempting to power the instrument. If the pack does not respond within 30 minutes of recovery charging, the cells have likely dropped below the safe recovery floor and the pack needs replacing.

Kanomax 3910 shuts down mid-measurement with no warning

This usually happens when the probe module initialises a secondary sensor during a logging sequence, pulling a current spike the ageing or partially discharged pack cannot sustain. The BMS interprets the voltage sag as an unsafe condition and cuts the output rail to protect the cells. The instrument shuts off cleanly rather than crashing, which is why users mistake it for a software fault. Charge the pack fully to 12.6V before field use and confirm the battery percentage reads stable at reboot — if the display jumps erratically on power-up, the cells are no longer holding a consistent charge curve and the pack should be replaced.