About this replacement
Trilithic 860DSP Series — 7.2V Ni-MH Replacement Battery (90047000)
This is a 7.2V 2500mAh Ni-MH battery pack for the Trilithic 860DSP cable and signal level meter. It fits the 860DSP, 860DSP Analyzer, and 860 DSPi Cable Meter. OEM part number is 90047000.
- 860DSP and 860 DSPi compatibility: These meters share the same battery bay, connector pinout, and BMS communication protocol. The voltage rail and charge termination logic are identical across the DSP and DSPi variants, so one pack covers both platforms without modification.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the 860DSP platform. The BMS accepted the pack without fault codes, charge termination triggered correctly at capacity, and the meter's battery indicator tracked accurately through the discharge curve.
- Post-install calibration on the 860DSP: After fitting this pack, run a full calibration cycle through the instrument menu before heading to the field. The 860DSP maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session, even with a fully charged pack.
860DSP shutting down mid-measurement with the battery indicator showing charge
Ni-MH cells degrade unevenly under shallow cycling — a pack used for short daily sessions loses capacity from individual cell imbalance, not total voltage collapse. When the meter draws sustained current during active signal scanning, a weaker cell in the pack drags the voltage below the BMS cutoff threshold before the indicator registers low. The instrument sees a sudden voltage drop and trips off as a protection event. A full discharge-to-cutoff followed by a full charge rebalances the cells and typically resolves this.
860DSP not recognising the new pack after months in storage
Ni-MH packs self-discharge during storage — if this pack sat in a warehouse below approximately 5.4V, the BMS may enter sleep mode and refuse to respond to the instrument. The 860DSP will either show no battery icon or fail to power on at all. Connect the pack to the OEM charger for a minimum of 30 minutes before inserting it into the meter — most chargers can recover a sleeping pack once a trickle current is applied. If the charger shows no activity after 30 minutes, cycle it off and on to force a recovery attempt.