AEG ARE H5 Laser Distance Meter Replacement Battery 7.4V 800mAh

AEG ARE H5 / AREH5-1 RFID Reader — 7.4V Li-ion Replacement Battery (70178)

This is a 7.4V, 800mAh Li-ion battery for the AEG ARE H5 laser distance meter and AREH5-1 RFID Reader. Both instruments run on the same OEM part 70178 battery pack, sharing an identical voltage rail and connector footprint. Capacity is 800mAh (5.92Wh), matched to the original specification.

• ARE H5 and AREH5-1 platform fit: Both models draw from the same 7.4V rail and use the same BMS handshake protocol. The connector orientation and latch geometry are identical across both units, so one replacement pack covers either instrument without modification.
• Bench tested on actual hardware: We ran this pack through full charge-discharge cycles on the ARE H5 platform and monitored BMS behaviour under sustained sensor load. The protection circuit held within spec during measurement logging sessions without tripping on normal draw.
• First-use calibration cycle: After installing this pack, run a full calibration cycle through the instrument menu before field deployment. The ARE H5 maps battery state during calibration — skipping this step causes the low-battery indicator to fire early on the first measurement session, even with a fully charged pack.

BMS lockout after the ARE H5 sat unused in a carry case for months

Li-ion cells self-discharge over time, and if the pack drops below roughly 2.5V per cell (5.0V total), the BMS enters a protective lockout state. In this condition the instrument shows no response — no boot screen, no charge indicator. Standard chargers will not re-engage the pack because the BMS blocks current below the recovery threshold. To recover it, use a charger with a trickle or recovery mode that applies a low current to bring the pack back above the BMS recovery voltage, typically around 6.0V, before switching to normal charge.

ARE H5 shuts off during USB data transfer to PC

USB data transfer activates the instrument's communication module simultaneously with the active display and measurement circuit — combined draw spikes briefly above what a degraded or partially charged cell can sustain. The BMS interprets the voltage sag as an undervoltage condition and cuts output to protect the cells. This is not a firmware fault. Charge the pack fully before any transfer session and confirm the cell rests at 8.4V off-charger before connecting via USB.