About this replacement
Olympus EPOCH 6LS / 6LT — 7.2V Li-ion Replacement Battery (003-003988-01)
This 7.2V 3450mAh Li-ion battery replaces the OEM pack in the Olympus EPOCH 6LS and EPOCH 6LT ultrasonic flaw detectors. These are portable nondestructive testing instruments used in field inspection of metals and composites. Capacity matches the factory specification at 3450mAh (24.84Wh).
- EPOCH 6LS and 6LT compatibility: Both models share the same battery bay geometry, 7.2V rail, and BMS communication protocol. The connector is identical across the LS and LT variants, so one pack covers both instruments without modification.
- Bench tested on actual hardware: We cycled this pack through the EPOCH 6LS power-on sequence and ran the transducer probe initialisation routine. The BMS held the output rail stable through the inrush current spike at probe power-up — the point where weak cells typically cause the instrument to fault out.
- First deployment calibration: After installing, run a full calibration cycle through the instrument menu before field deployment. The EPOCH 6LS maps battery state during calibration, and skipping this step causes premature low-battery warnings during your first measurement session.
BMS cutoff at probe initialisation on the EPOCH 6LS
When the EPOCH 6LS powers up a connected transducer, the probe excitation circuit draws a short inrush current that can exceed the BMS overcurrent threshold on a marginal cell. The instrument shuts down immediately — not because the battery is discharged, but because the BMS tripped on peak amperage. This pack's cells are rated for the inrush profile the EPOCH transducer circuits produce. If the instrument still trips at probe connection, confirm the probe cable is not damaged, as a shorted transducer amplifies the spike beyond what any pack will tolerate.
EPOCH 6LT shuts down mid-session during sustained pulse logging
During continuous pulse-echo logging at high PRF (pulse repetition frequency), the sustained draw causes voltage sag in aged or cold cells — the instrument's undervoltage protection trips before the battery indicator reaches the low warning zone. The display may show 30–40% charge remaining at the point of shutdown. This is a voltage sag failure, not a capacity failure. After the shutdown, rest the pack for two minutes and power on again — if it recovers immediately, the cell internal resistance is elevated and the pack should be replaced. A healthy pack at 7.2V nominal should read no lower than 6.8V under continuous probe load.