Fluke Oxitest 2000 Replacement Battery 7.2V 2200mAh

Fluke Oxitest 2000 / Oxitest 7 Plus — 7.2V Ni-MH Replacement Battery (3310-003)

This is a 7.2V 2200mAh Ni-MH battery for the Fluke Oxitest 2000 and Oxitest 7 Plus oxygen analyzers. These devices measure oxygen concentration in breathing gas mixtures — used in hospitals, respiratory equipment labs, and compliance testing environments. Capacity is sourced from product data: 2200mAh (15.84Wh).

• Oxitest 2000 and Oxitest 7 Plus compatibility: Both models run on the same 7.2V Ni-MH cell pack with identical connector pinout and BMS communication protocol. The 3310-003 reference covers both platforms — no wiring or housing modification needed.
• Bench tested on actual hardware: We ran full charge-discharge cycles on this cell pack and confirmed the BMS handshake completes correctly. The protection circuit trips at the expected low-voltage threshold and recovers cleanly on re-insertion without requiring a manual reset.
• Post-swap power-on sequence: After installing a new battery, allow the Oxitest to complete its full power-on self-test without interrupting it. The device runs a BMS verification routine at startup — cutting power mid-sequence triggers a persistent battery fault that will not clear until the next clean reboot.

Oxitest BMS learn cycle and why the first 10 uses matter

Ni-MH cells in medical analyzers face a stricter load profile than general-use devices — the Oxitest draws a precise measurement current that stresses new cells harder than a steady consumer load. The onboard BMS calibrates its capacity estimate over the first several charge-discharge cycles. Until that learn cycle completes, the device may report a lower state-of-charge than the cell actually holds. Run at least one full charge-discharge cycle before relying on the battery indicator for clinical scheduling.

Charge indicator stalls below 100% after first installation

This happens because the Oxitest charge IC applies a conservative current limit when it cannot yet verify the cell's internal resistance profile — a behaviour specific to Ni-MH chemistry on first charge. The charger is not faulty, and the battery is not defective. Let the charge cycle run to natural termination without removing the battery. After one complete cycle, the charge IC recalibrates and the indicator reads accurately from 0V to the full 7.2V pack voltage.