About this replacement
Satlink WS-6908 Series — 7.4V Li-Polymer Replacement Battery (F03409)
This is a 7.4V 1000mAh Li-Polymer battery for the Satlink WS-6908, WS-6909, WS-6912, and WS-6932 satellite signal meters, plus five additional compatible models. It replaces OEM part numbers F03409 and E-1544. If your meter is dropping power mid-alignment or no longer holding charge in the field, this is the direct replacement pack.
- WS-6908 series compatibility: These models share the same 7.4V power rail, physical connector, and BMS handshake protocol. The pack slots and communicates the same way across all listed meters — no modification needed.
- Bench tested on actual hardware: We ran this pack through probe initialisation cycles on the WS-6908 and confirmed the BMS handled the current spike at signal acquisition without tripping into protection mode. Charge acceptance and cell balance checked out across multiple cycles.
- Post-install calibration on the WS-6908 series: After fitting this pack, run a full calibration cycle through the instrument menu before field deployment. The meter maps battery state during calibration — skipping this step causes premature low-battery warnings during your first measurement session even when the pack is fully charged.
BMS lockout after the WS-6908 sat unused in a carry case for months
Li-Polymer cells self-discharge slowly during storage. If the meter sat unused long enough, cell voltage can drop below the BMS recovery threshold — typically around 2.5V per cell for a 7.4V pack. At that point the BMS locks the pack out as a safety measure and the meter will not power on at all. Connect the charger and leave it for at least 30–60 minutes without interruption — most chargers have a trickle pre-charge stage that recovers the cell voltage to the point where the BMS re-initialises and accepts a full charge.
Meter shuts down mid-alignment despite the battery indicator showing charge
This happens when cell capacity has degraded enough that voltage sags sharply under the sustained load of active signal processing and display backlight together. The battery indicator reads resting voltage — it does not account for voltage drop under load. When loaded voltage dips below the BMS cutoff threshold, the meter shuts off even though the indicator showed remaining charge seconds before. Replace the pack and confirm the resting voltage sits above 7.2V before heading into the field.