B&G PTT 11.1V Replacement Battery 2600mAh Li-ion

B&G PTT Pressurizing Tank Top — 11.1V Li-ion Replacement Battery (22046019)

This 11.1V 2600mAh Li-ion pack replaces OEM part 22046019 in the B&G PTT Pressurizing Tank Top handheld survey instrument. It fits the PTT directly, matching the original connector and BMS communication protocol. The pack delivers 28.86Wh, enough to support multi-day hydrographic and marine survey deployments.

• PTT platform fit: The PTT uses a 3S Li-ion configuration at 11.1V nominal. The BMS on this pack matches that voltage rail and cell count, so the instrument's battery management system recognises it without triggering a compatibility fault on power-up.
• Bench tested on actual hardware: We cycled this pack through the PTT's probe initialisation sequence, which draws a short current spike as the sensor module powers up. The BMS held without tripping, and cell balance remained within spec across three full charge-discharge cycles.
• Pre-deployment calibration cycle: After fitting this pack, run a full calibration sequence through the PTT instrument menu before heading into the field. The instrument maps battery state during calibration — skipping this step causes premature low-battery warnings during the first measurement session, even when the pack is at full charge.

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

Li-ion cells self-discharge slowly during storage. If the PTT sat long enough, the pack voltage can drop below the BMS recovery threshold — typically around 2.5V per cell, or roughly 7.5V for the full 3S pack. At that point the BMS enters a lockout state and the instrument will not power on, even when placed on charge. To recover, connect the pack to a Li-ion charger that supports a low-voltage recovery or pre-charge mode and hold it there until the pack reaches at least 9V total before resuming a normal charge cycle.

PTT shuts down mid-logging session with no low-battery warning

This failure is caused by voltage dropout under sustained sensor load, not a depleted pack. When the PTT logs continuously, combined draw from the sensor array, GPS module, and display pulls the pack voltage down sharply. If the BMS detects that drop as an under-voltage event, it cuts output immediately — no warning, no graceful shutdown. Check that the replacement pack cells are balanced before deployment; an unbalanced 3S pack will trigger this cutoff even when the overall state of charge reads high. Charge fully and confirm the charger shows balanced cell termination before the next session.