Garmin Edge 605 Replacement Battery 3.7V 1250mAh

Garmin Edge 605 / Edge 705 — 3.7V Li-Polymer Replacement Battery (361-00019-12)

This is a 3.7V 1250mAh Li-Polymer cell for the Garmin Edge 605, Edge 705, and NUVI 465 GPS devices. It replaces OEM part 361-00019-12 and fits the original battery bay without modification. Capacity figures come from the product data: 1250mAh / 4.63Wh.

• Edge 605 and Edge 705 shared platform: Both cycling computers run the same 3.7V power rail and use the same connector pinout and BMS handshake, which is why a single cell covers both units. Swapping between them requires no adapter or wiring change.
• Bench tested on actual hardware: We ran this cell through charge cycles on the Edge 705 and confirmed the BMS accepted the cell without throwing a fault code. Charge acceptance was normal and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Cold-start satellite acquisition after swap: After fitting this cell, power the unit on outdoors and let it run a full satellite acquisition before your first ride. A cold start after any power interruption can take 5–10 minutes for first fix — subsequent warm starts drop back under a minute once almanac data is cached.

GPS accuracy reduced at low battery on the Edge 605

As cell voltage drops toward the low-end threshold, some GPS units pull back receiver sensitivity to reduce current draw. On the Edge 605, this shows up as wider track scatter or position jumps that do not appear at full charge. The fix is straightforward: replace the cell before capacity fade pushes resting voltage below 3.5V under load. A fresh 1250mAh cell keeps the receiver running at full sensitivity through the entire discharge curve.

Edge 605 shuts off without warning before the battery indicator reads empty

The on-screen battery gauge is calibrated against the original cell's discharge curve. An aged or replacement cell with a slightly different curve hits the hardware voltage cutoff — typically around 3.0V — before the gauge reaches the last bar. The device cuts power mid-ride with no low-battery alert. After fitting the new cell, run two full charge-to-discharge cycles so the firmware can recalibrate the gauge against the actual discharge profile of the new cell.