Hioki LR8511 Replacement Battery 7.4V 2200mAh Z1007

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

This is a 7.4V, 2200mAh Li-ion battery that replaces the Hioki Z1007 original pack. It fits the LR8511 and LR8510 portable data loggers used for temperature and humidity recording in field and industrial environments. Voltage and cell chemistry match the original specification exactly.

• LR8511 and LR8510 compatibility: Both models share the same battery bay dimensions, connector pinout, and BMS handshake protocol. The Z1007 form factor — 71.84 × 39.11 × 21.41mm — seats flush in either unit without modification.
• Bench tested on actual hardware: We cycled this pack through the LR8511's charge and discharge management circuit. The BMS accepted the cell, balanced correctly across both channels, and held steady voltage through sustained logging draws without triggering protection cutoff.
• Field deployment tip for the LR8510 and LR8511: These loggers sample continuously during deployment. Before sending a unit into the field, run a full charge cycle in the logger itself — not a standalone charger — so the onboard BMS can calibrate its state-of-charge register against the new cell's actual capacity curve.

Why the LR8511 reports low battery immediately after a pack swap

The LR8511 tracks battery state using a coulomb-counting register in the BMS, not a raw voltage reading. When you fit a new pack, that register may still hold the depleted value from the old battery. The logger then reports low battery even though cell voltage is at nominal 7.4V. A full charge cycle through the logger resets the register and aligns the display with actual cell capacity.

LR8510 or LR8511 powering off mid-recording session

Mid-session shutdowns on these loggers are almost always a BMS undervoltage trip, not a faulty cell. The protection circuit cuts output when pack voltage drops below approximately 6.0V under load. This happens fastest when the cell has been stored discharged for an extended period — lithium-ion self-discharges roughly 2–3% per month, and a pack sitting at low state of charge for several months can sag past the cutoff threshold within minutes of a high-draw logging burst. Fully charge the new pack to 8.4V before the first deployment to prevent this.