Deviser AE2300 Replacement Battery 7.4V 4000mAh HYLB-1787

Deviser AE2300 Series — 7.4V Li-ion Replacement Battery (HYLB-1787)

This 7.4V 4000mAh Li-ion battery replaces the HYLB-1787 pack in the Deviser AE2300, AE2300H, and AE2300L total stations. It fits the same connector housing and communicates with the instrument's BMS over the same handshake protocol as the factory pack. Capacity is rated at 29.6Wh — sourced from product data, not estimated.

• AE2300, AE2300H, and AE2300L compatibility: All three variants share the same battery bay geometry, connector pinout, and BMS communication protocol, which is why a single HYLB-1787 pack covers the whole AE2300 platform.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge sequences and monitored BMS response during motor-drive initialisation. The protection circuit held voltage within the accepted window at startup without tripping into cutoff.
• First-deployment calibration: After fitting this battery, run a full calibration cycle through the AE2300's instrument menu before heading to site. The instrument maps battery state during calibration — skip this and you will see premature low-battery warnings during your first measurement session in the field.

BMS lockout after the AE2300 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If the pack voltage drops below roughly 2.5V per cell — around 5.0V total for a 2S pack like this one — the BMS trips into deep-discharge lockout and will not respond to a charger. The instrument will not power on, and the charger shows no charging activity. To recover, apply a compatible charger that supports a trickle or pre-charge mode, which slowly raises cell voltage until the BMS re-enables the charge path. Once voltage climbs above the recovery threshold, normal charging resumes automatically.

AE2300 shutting down mid-measurement with a charged pack

The angle encoder and EDM module together draw a short current spike when the instrument initialises a measurement — particularly during distance lock-on. If the cell internal resistance is elevated, this spike causes a momentary voltage sag that crosses the BMS undervoltage cutoff threshold, and the instrument shuts off even though the battery was showing adequate charge. This is not a low-capacity problem; it is a resistance problem caused by aged or cold cells. At ambient temperatures below 5°C, warm the instrument to room temperature first, then retry — if shutdown persists above 10°C, the cell impedance has risen beyond usable range and replacement is the correct step.