About this replacement
GretagMacbeth Densitometer D196 — 7.2V Ni-MH Replacement Battery (362132)
This 7.2V 1800mAh Ni-MH battery replaces part number 362132 in the GretagMacbeth D196 densitometer. It also fits the Densitometer D19C and SpectroEye spectrophotometers. All three instruments share the same voltage rail, connector, and BMS handshake protocol.
- D196, D19C, and SpectroEye compatibility: These instruments run the same 7.2V power architecture and use an identical pack form factor with matching BMS communication lines. A single replacement cell works across all three without adapter modification.
- Bench tested on actual hardware: We cycled this pack through the D196 charge sequence and monitored BMS handshake signals throughout. The protection circuit responded correctly to charge termination and load cutoff within expected thresholds.
- Post-installation self-test protocol: After fitting this battery, let the D196 complete its full power-on self-test without interruption. The device runs a BMS verification routine at startup — interrupting it triggers a false battery fault that persists until the next clean reboot.
Why the D196 flags a low-battery alarm immediately after a confirmed full charge
The D196's BMS stores a charge-acceptance profile from the previous cell and compares incoming voltage rise against that baseline. A fresh Ni-MH cell has a slightly different charge curve than a degraded original pack, so the BMS can interpret the new cell's behaviour as a fault condition. This typically resolves after one complete charge-discharge cycle, which allows the BMS to rewrite its reference data. If the alarm persists past two full cycles, check that the terminal voltage at full charge reads at least 8.4V.
D196 not completing boot sequence after the battery sat unused in storage
Ni-MH cells self-discharge in storage and can drop below the BMS recovery threshold — typically around 5.4V for a 7.2V pack. When the D196 detects pack voltage below that floor, it refuses to boot rather than risk running measurement circuits on an unstable supply. Place the battery on charge for a full uninterrupted cycle before installing it. If the device still won't boot, confirm the pack is reading at least 6.0V at the terminals before reinserting it.