Overview
Low power and unreliable charging are common root causes of "won't connect" and "random shutdown" reports. Charge with the cable supplied with the device through a USB source delivering at least 5 V / 0.5 A. A full charge takes about 1.5 hours. Charge only between 0 °C and 45 °C.
Charging and power-on indicators
- Solid red LED while charging.
- Solid green LED when fully charged.
- Press and hold the MAIN button to power on or off — same control on Compass Core, Compass Pro, and Compass Pro IS.
- On power-up the device runs a sweeping green LED display showing battery state of charge (more LEDs lit = more charge).
Expected battery life
Compass Core and Compass Pro use a 3.7 V / 250 mAh Li-Po cell rated for about 6 days (48+ hrs) of typical use. Compass Pro IS uses a 3.7 V / 85 mAh Li-ion cell rated for about 2 days (16+ hrs). Battery life varies with the number of alerts the device generates.
Recommended sequence
- Inspect for physical damage. If compromised, remove from service per internal safety policy.
- Open the USB cover and connect the supplied cable. Confirm the solid red charging LED — if it does not appear, wait a minute, since a deeply depleted battery takes time before charging indication is visible.
- Wait for the solid green LED indicating a full charge.
- Press and hold the MAIN button to power on; confirm the sweeping green battery-status display.
- Watch the heartbeat settle in (every 2 seconds) before pairing or mounting.