About this replacement
SCANGRIP Mini Mag Pro COB LED — 3.7V Li-ion Replacement Battery (03.5767)
This is a 3.7V, 1200mAh Li-ion replacement battery for the SCANGRIP Mini Mag Pro COB LED work light (03.5692). It slots into the compact flashlight body and powers the COB LED driver directly. Capacity matches the original at 1200mAh (4.44Wh).
- Mini Mag Pro COB LED fit: The 03.5692 uses a single-cell 3.7V Li-ion pack with a fixed connector footprint. This cell matches that voltage rail and physical format — the BMS handshake initialises without triggering a protection fault on first charge.
- Bench tested on actual hardware: We cycled this cell through the Mini Mag Pro's driver circuit across low, medium, and turbo output modes. The BMS held cutoff at 2.75V under high-current draw and resumed normal charging without manual reset.
- Turbo mode discharge rate: The COB driver pulls significantly more current in turbo mode than in standard or low modes. Running the light continuously on turbo accelerates cell depletion — switch to medium output for extended task lighting sessions to keep cell voltage above the BMS cutoff threshold.
Why the Mini Mag Pro dims hard before the low-battery indicator triggers
The COB driver in the 03.5692 uses brownout protection to step output down when cell voltage drops below a set threshold — typically around 3.2V. This happens before the low-battery LED indicator activates, so the light appears to dim suddenly with no warning. It is not a fault — it is the driver protecting the cell from over-discharge. If dimming occurs early in a session, the cell is likely degraded and no longer holding charge near its rated capacity.
Light flickering or cycling between modes near end of charge
Mode-cycling at low charge is a symptom of the driver repeatedly hitting and recovering from its brownout threshold. As cell voltage sags under load, the driver cuts output; voltage briefly recovers with no load, and the driver restores output — creating a flicker loop. This is not a driver fault. Switch the light to low mode to stabilise output until the cell is recharged. If cycling starts at the beginning of a charge cycle rather than the end, cell capacity has degraded and replacement is needed — check resting voltage with a multimeter; a healthy cell at full charge reads 4.1–4.2V.