Garmin Edge 800 Replacement Battery 3.7V 1000mAh

Garmin Edge 800 / Edge 810 — 3.7V Li-ion Replacement Battery (KE37BE49D0DX3)

This 3.7V, 1000mAh Li-ion cell replaces the original battery in the Garmin Edge 800 and Edge 810 cycling computers. It matches the OEM part number KE37BE49D0DX3 and fits the same 51.00 × 34.00 × 5.00mm cavity. Capacity is rated at 3.7Wh — identical to the factory specification.

• Edge 800 and Edge 810 compatibility: Both models share the same battery bay dimensions, connector pinout, and charge circuit. One cell covers either unit without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the Edge 800 platform. The onboard charge circuit accepted the cell cleanly — no fault codes, no cutoff on initial charge.
• Cold-start satellite acquisition after swap: After fitting this cell, power the unit fully on outdoors before your first ride. With no prior GPS lock data in memory, the receiver runs a full cold start that typically takes 5–10 minutes. Subsequent locks from the same area drop to under a minute once almanac data is cached.

Why the Edge 800 shuts off without warning at low battery

The Edge 800 reads the battery fuel gauge from a voltage curve stored at the factory. When the original cell ages, that curve drifts — the device shows 20% charge and then cuts off seconds later. A new cell resets the actual voltage range, but the gauge calibration takes one or two full discharge cycles to re-anchor. Expect the indicator to read slightly off for the first two rides. After two complete charge-to-cutoff cycles, the displayed percentage will track the true cell state accurately.

Saved routes missing after battery replacement

The Edge 800 stores course and route data in flash memory, which is non-volatile and survives a full power loss. However, active ride data and some real-time navigation state sit in RAM and are cleared the moment the battery drops out. If a course was in progress during removal, that in-progress session will not recover. Completed courses saved before the swap will still appear under the Courses menu — check there before re-importing from Garmin Connect.