Spectra Precision SP60 GNSS Replacement Battery 7.4V 3400mAh

Spectra Precision SP60 / SP80 GNSS — 7.4V Li-ion Replacement Battery

This is a 7.4V, 3400mAh (25.16Wh) lithium-ion battery pack for the Spectra Precision SP60 and SP80 GNSS receivers. Both are field-deployed survey instruments that depend on continuous power during active positioning sessions. This pack slots directly into either receiver and communicates with the onboard BMS using the same voltage rails and connector pinout as the original.

• SP60 and SP80 shared battery platform: Both receivers run the same 7.4V two-cell Li-ion architecture with an identical physical form factor and BMS handshake protocol. Spectra Precision standardised the battery across this GNSS line so field crews can carry one spare and swap between units on the same job site.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on SP60 hardware. The BMS negotiated state-of-charge correctly, cell balancing engaged at end-of-charge as expected, and the receiver reported accurate battery status on the status screen throughout.
• Post-install calibration cycle: After fitting a new pack, run a full calibration cycle through the SP60 or SP80 instrument menu before heading into the field. The receiver maps battery state during that process, and skipping it causes premature low-battery warnings to appear during your first positioning session even when the pack is well charged.

BMS lockout after the SP60 sat unused in a carry case for months

Li-ion cells self-discharge during storage. If an SP60 battery sits unused long enough, cell voltage drops below the BMS recovery threshold — typically around 2.5V per cell — and the protection circuit latches into lockout to prevent deep-discharge damage. At that point the receiver will not power on and the charger may not respond. Connect the pack to the OEM charger and leave it for at least 30–60 minutes without interruption — many chargers apply a low-current trickle at first to pull the cells back above the recovery threshold before switching to normal charge current. If the charger LED stays unresponsive past that window, cell voltage has likely dropped too far for recovery and a replacement pack is needed.

SP60 shuts down mid-RTK session with no low-battery warning

This happens when sustained GNSS processing load — particularly during active RTK correction streaming — causes a voltage dropout that the battery indicator did not predict. An aged or partially degraded cell has higher internal resistance, so voltage sags sharply under the combined draw of the radio modem, GNSS engine, and tilt sensor. The receiver's undervoltage protection trips before the on-screen percentage reaches zero. Check the pack's resting voltage with a multimeter: a healthy 7.4V two-cell pack should read between 7.8V and 8.2V at rest after a full charge — anything below 7.4V at rest signals a cell that can no longer hold its nominal voltage under load.