About this replacement
Chatillon Force DFE / Force DFS Series — 4.8V Ni-MH Replacement Battery (482-BH3PER)
This is a 4.8V 2000mAh Ni-MH replacement battery for the Chatillon Force DFE, Force DFS, Force DFS-R, and Force SPK-DF-112 digital force gauges. It replaces OEM part numbers 482-BH3PER, 552096, OM11484, and SPK-DFX2-158. Capacity is 2000mAh (9.6Wh) — matching the original specification.
- Force DFE and DFS series compatibility: These gauges share the same battery compartment dimensions, connector pinout, and 4.8V supply rail. The BMS handshake is identical across the DFE, DFS, DFS-R, and SPK-DF-112 variants, so one pack covers all four platforms without modification.
- Bench tested on actual hardware: We cycled this pack through the Force DFE measurement firmware under sustained tension and compression logging. The BMS held voltage steady through repeated peak-load events at sensor initialisation, and the charge circuit accepted a full charge cycle without thermal cutoff or fault flags.
- Calibration cycle before first field use: After installing this pack, run a full calibration cycle through the instrument menu before deploying it on-site. The Force DFE maps battery state during calibration — skipping this step causes the gauge to throw premature low-battery warnings during your first measurement session, even with a fully charged pack.
BMS lockout after the Force DFE sat unused in a carry case for months
Ni-MH cells self-discharge over time. If the gauge has been shelved for several months, the pack voltage can drop below the BMS recovery threshold — typically around 3.6V for a 4-cell 4.8V Ni-MH pack. When this happens, the charger may not initiate a charge cycle because the BMS reads the pack as faulty rather than deeply discharged. The fix is to apply a low-current trickle charge for 15–30 minutes to bring the pack above the recovery threshold before connecting to the standard charger. Once voltage clears 4.0V, the normal charge cycle will start.
Force DFE shuts down mid-measurement during a logging session
This is a voltage sag issue, not a capacity failure. Under sustained sensor load during continuous data logging, the combined draw from the display, measurement circuit, and USB output can pull voltage below the instrument's cutoff threshold momentarily — even when the pack shows adequate charge at rest. Aged Ni-MH cells with elevated internal resistance sag harder under this combined load than a fresh pack will. Replacing the pack resolves the dropout; after installation, confirm resting voltage reads at or above 5.0V before starting a logging session.