Sureshotgps 8800 Compatible Battery 3.7V 1050mAh Li-ion

Sureshotgps 8800 / 8850 / 1110-1 — 3.7V Li-ion Replacement Battery (039B)

This 3.7V, 1050mAh lithium-ion cell replaces the original battery in Sureshotgps 8800, 8850, and 1110-1 portable GPS navigators. It matches the OEM dimensions at 51.10 × 34.49 × 5.40mm and slots into the same bay without modification. Voltage and capacity are drawn from product data — 3.89Wh total energy.

• 8800, 8850, and 1110-1 compatibility: All three models share the same battery bay dimensions, 3.7V supply rail, and connector pinout — one cell covers the whole group without adapters or wiring changes.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench. The BMS held the cutoff voltage steady and the protection circuit tripped correctly at low-cell threshold — no runaway, no false shutoff under normal GPS load.
• First-fix tip after fitting: After installing this cell, power the unit on outdoors immediately and let it run a full cold-start satellite acquisition. A cold start after full power removal can take 5–10 minutes for first fix — this clears once the almanac data refreshes and subsequent locks return to under a minute.

GPS accuracy reduced when battery drops below half charge

Some GPS units step down receiver sensitivity as cell voltage falls — typically below 3.6V — to reduce current draw and extend operation. The result is weaker satellite signal acquisition, wider position error, and slower route recalculation. It reads like a hardware fault but the root cause is a low-voltage power management decision in the firmware. Keep the cell above 3.7V during active navigation to hold full receiver performance.

Device shuts off without warning before the battery indicator reaches empty

The on-screen battery gauge in the 8800 series is calibrated to the original cell's discharge curve. A new cell — or an aged one — can have a slightly different curve, so the device hits its hardware low-voltage cutoff before the indicator shows one bar. This is a calibration mismatch, not a fault with the cell. Run two or three full charge-to-cutoff cycles and the firmware's fuel gauge will recalibrate to the new cell's curve — target a full charge to 4.2V before each discharge cycle during this break-in period.