Fluke BP130 ScopeMeter Replacement Battery 4.8V 3000mAh

Fluke ScopeMeter 123/124 Series — 4.8V Ni-MH Replacement Battery (BP130)

This 4.8V 3000mAh Ni-MH pack replaces the original BP130 and BP120MH batteries in the Fluke ScopeMeter 123, 123S, 124, and 124S portable oscilloscopes. These handheld scopes are used for field electrical troubleshooting, and this battery restores cordless operation when the original pack no longer holds charge. Voltage and cell count match the OEM spec exactly.

• ScopeMeter 123 and 124 platform fit: All four models — 123, 123S, 124, 124S — share the same battery bay dimensions, connector pinout, and 4.8V charge rail. The BMS in each unit uses the same charge termination logic, so one pack covers the full family without modification.
• Bench tested on actual hardware: We cycled this pack in a ScopeMeter 124 under sustained waveform capture load. The BMS accepted the charge cycle cleanly, delta-V termination triggered at the correct point, and the unit held a stable supply voltage through repeated probe initialisation events.
• Post-install calibration cycle: After fitting this pack, run a full calibration cycle through the ScopeMeter's instrument menu before field deployment. The unit maps battery state during calibration — skipping this step causes the low-battery indicator to fire prematurely on the first active measurement session.

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

Ni-MH cells self-discharge continuously in storage, and if the pack drops below roughly 1.0V per cell the BMS trips into a protection state and blocks both charging and power output. The ScopeMeter will appear completely dead — no screen, no charge indicator — even when connected to the charger. To recover, connect the charger and leave it for at least 30 minutes before pressing power; many units will resume normal charge once the BMS detects a minimum input voltage above the lockout threshold. If the original pack has been in storage for over a year, replacing it is faster than attempting recovery.

ScopeMeter shuts off mid-measurement with the battery indicator still showing charge

This happens when the probe module initialises and pulls a short current spike the weakened pack cannot sustain — the cell voltage sags below the BMS cutoff threshold momentarily and the unit drops out, even though the resting voltage looked acceptable seconds before. A fresh pack with full cell capacity recovers from that transient draw without tripping the cutoff. To confirm this is the cause, attempt power-on without any probe connected — if the unit stays on, the pack is failing under load rather than at rest. Replace the battery and re-run the calibration cycle before returning to service.