Chauvin Arnoux 1060 Replacement Battery 9.6V 3500mAh

Chauvin Arnoux 1060 / 6430 Series — 9.6V Ni-MH Replacement Battery (2960.21)

This is a 9.6V, 3500mAh Ni-MH replacement battery for Chauvin Arnoux test and survey instruments. It fits the 1060, 6430, 5050, and 5070 series, among others. OEM part numbers 2960.21 and 525832D00 cross-reference directly to this pack.

• 1060 / 6430 / 5050 / 5070 compatibility: These models share the same 9.6V rail, connector footprint, and BMS handshake protocol — one pack covers the full group without modification or adapter.
• Bench tested on actual hardware: We cycled this pack under sustained sensor and probe load. The BMS held steady through probe initialisation spikes and sustained logging draws without tripping into cutoff.
• Post-install calibration step: After fitting this pack, run a full calibration cycle through the instrument menu before field use. The instrument maps battery state during calibration — skipping it causes premature low-battery warnings on the first measurement session.

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

Ni-MH cells self-discharge during storage. If the pack drops below approximately 0.9V per cell, the BMS enters a protective sleep state and the instrument shows no response on power-up. A standard charger may refuse to initiate a charge cycle because it reads the pack voltage as too low to be a valid battery. Most smart chargers have a recovery or "boost" mode that applies a low-current trickle until the pack reaches a safe threshold — typically around 8.0V — before switching to normal charge. Once the pack recovers to that level, a standard charge cycle completes normally.

Readings drifting or logging session resetting mid-measurement

Under sustained sensor load — particularly when multiple probe channels are active simultaneously — pack voltage can sag momentarily below the instrument's operating floor. The instrument interprets this voltage dropout as a shutdown event rather than a transient, which resets the active logging session. This is more common with aged cells but can also occur with a new pack that has not been fully conditioned. Run two full charge-discharge cycles before a long field session, and confirm resting voltage sits at or above 9.6V before deployment.