Panametrics KR1800SCE Replacement Battery 6V 3000mAh Ni-MH

Panametrics PT878 / Magna-Mike 8500 — 6V Ni-MH Replacement Battery (KR1800SCE)

This 6V, 3000mAh Ni-MH pack replaces the KR1800SCE battery in the Panametrics PT878 Flowmeter and Magna-Mike 8500. Both instruments are portable ultrasonic measurement devices used in pipe flow surveys and wall-thickness gauging. Same voltage, same form factor — 112.30 x 45.00 x 22.80mm — no modification needed.

• PT878 and Magna-Mike 8500 compatibility: Both instruments run a 6V Ni-MH rail with the same physical bay and connector layout. The BMS on each platform expects the same charge termination signature, so a single cell specification covers both without re-configuration.
• Bench tested on actual hardware: We ran this pack through charge and load cycles on a PT878 unit. The BMS accepted charge termination normally, transducer initialisation did not trip an overcurrent cutoff, and sustained sensor load held voltage within the instrument's operating window.
• First-use calibration cycle: After fitting the new pack, run a full calibration cycle through the PT878 instrument menu before field deployment. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session, even with a fully charged pack.

BMS lockout after the PT878 sat unused in a carry case for months

Ni-MH packs self-discharge at roughly 1–2% per day at room temperature. A PT878 left in a case for several months can arrive at a voltage low enough that the BMS enters a protection state and refuses a standard charge cycle. The instrument will appear completely dead — no display response, no charge indicator. Recovery requires a slow pre-charge at low current (typically 0.1C) to bring cell voltage above the BMS recovery threshold before normal charging resumes. Most quality chargers with a recovery or conditioning mode handle this automatically — check your charger's manual and use that mode first.

PT878 readings resetting or drifting mid-logging session

This is not a calibration fault — it is a voltage dropout event. Under sustained transducer load during a long logging session, an aged or partially discharged Ni-MH pack can sag below the PT878's minimum operating voltage, causing the processor to reset without fully powering off. The display may flicker or revert to a previous measurement state. A fresh, fully charged pack eliminates the sag; if the symptom persists on a new pack, check that the battery contacts in the bay are clean and making solid contact — target above 5.8V under load at the terminals.