Hioki LR8511 Replacement Battery 7.4V 3000mAh Z1007

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

This is a 7.4V 3000mAh Li-ion replacement battery for the Hioki LR8511 and LR8510 portable temperature and humidity data loggers. It matches OEM part number Z1007 and fits directly into both recorder models. Capacity is drawn from product data: 3000mAh / 22.2Wh.

• LR8511 and LR8510 compatibility: Both models use the same battery bay geometry, connector pinout, and BMS communication protocol — one cell covers the full pair without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the LR8511 platform. The onboard BMS accepted the cell without fault codes, and voltage regulation across the logger's sensor and wireless channels stayed within spec throughout the test window.
• First-use charge on the LR8511: Before starting a logging session, charge the pack fully in the LR8511 via the supplied AC adapter. The logger's internal clock and memory backup circuit draws from the same cell — a partially charged pack on first use can cause the RTC to reset mid-session, which corrupts timestamp data on export.

Why the LR8511 shows a low-battery warning shortly after a fresh pack is installed

Li-ion cells ship at a partial state of charge — typically 30–50% — for transport safety compliance. The LR8511's fuel gauge reads this as a low cell immediately on boot and flags the warning. This is not a fault with the battery. Run the pack through one full charge cycle via the AC adapter before deployment and the gauge will recalibrate to the cell's actual capacity.

LR8511 logging session stops and data file closes before the scheduled end time

The LR8511 performs a controlled shutdown when cell voltage drops to the BMS cutoff threshold — it closes the active data file cleanly rather than truncating it. If this happens earlier than expected, the cell has likely aged below usable capacity or was not fully charged before the session. Check the battery indicator in the device menu before starting any long-duration run. A freshly charged Z1007 replacement should hold the logger above the 6.8V cutoff for the full scheduled window under normal ambient conditions.