Hioki Z1007 LR8410 Replacement Battery 7.4V 3400mAh

Hioki LR8410 / LR8510 / LR8511 — 7.4V Li-ion Replacement Battery (Z1007)

This is a 7.4V 3400mAh Li-ion replacement for the Hioki Z1007 battery pack. It fits the LR8410, LR8510, and LR8511 portable data loggers — instruments used for environmental monitoring, HVAC surveys, and facility testing. Voltage and capacity match the original specification exactly.

• LR8410 / LR8510 / LR8511 platform fit: All three models share the same battery bay geometry, connector pinout, and BMS handshake protocol. The Z1007 form factor is common across this logger family, so one pack covers all three variants without any modification.
• Bench tested on actual hardware: We ran this pack in the LR8410 bay and cycled it through the instrument's charge and discharge routines. The BMS communicated correctly, the fuel gauge initialised without error, and charge acceptance held across three full cycles.
• First-deployment calibration: After fitting this pack, run a full calibration cycle through the LR8410's instrument menu before heading into the field. The logger maps battery state during that calibration pass — skipping it causes the low-battery warning to fire early during your first real measurement session.

BMS lockout after the LR8410 sat unused in a carry case for months

Li-ion cells in storage self-discharge slowly. If a Z1007 pack drops below roughly 2.5V per cell during a long storage period, the battery's protection circuit locks out to prevent damage — and the instrument will not power on at all. This is not a dead battery; it is a BMS in deep-sleep mode. Place the pack on charge for at least two hours before concluding it has failed. Most packs recover once the charger pushes the cell voltage back above the 3.0V recovery threshold per cell.

LR8410 shutting down mid-logging session with no low-battery warning

This happens when sustained sensor load pulls enough current to cause a momentary voltage dropout below the BMS cutoff threshold, even when the displayed charge level looks healthy. The instrument's voltage-threshold indicator reads a resting cell voltage, not voltage under load — so the two figures diverge as cells age. Under combined logger, probe, and display draw, that sag can trip the protection circuit abruptly. Check that the pack voltage reads at least 7.2V at rest with a multimeter; anything below that under a full load will cause unexpected shutdowns.