Olight ORB-186C30 Baton Pro Replacement Battery 3.6V 3400mAh

Olight Baton Pro / H2R / Perun — 3.6V Li-ion Replacement Battery (ORB-186C30)

This is a 3.6V, 3400mAh Li-ion 18650-format cell replacing the OEM ORB-186C30, ORB-186C32, and ORB-186C35 batteries. It fits the Olight Baton Pro flashlight, H2R headlamp, Perun headlamp, R20, and six additional Olight models that share this cell format. Same voltage, same capacity, same physical dimensions as the original.

• Baton Pro / H2R / Perun platform compatibility: These models share a common 18650 cell format with a matched voltage rail and magnetic USB charging circuit. The driver expects a 3.6V nominal cell — substituting a higher-voltage cell trips the BMS and prevents charging from completing correctly.
• Bench tested on actual hardware: We cycled this cell in the Baton Pro from full charge through discharge under turbo and mid-mode loads. The BMS held voltage within spec throughout, and the magnetic charging port re-seated without triggering an error state on reconnection.
• Single-cell replacement tip: The Baton Pro and H2R use one cell, so there is no balancing concern — but fully discharge the old cell before swapping. Inserting a partially charged replacement into a light whose driver has calibrated to a depleted cell can cause the low-battery indicator to misread immediately after install.

Turbo mode current draw and why this cell gets warm fast

Olight's turbo mode on the Baton Pro pulls sustained high current — far above what any standard mode demands from a single 18650 cell. That current draw generates heat inside the cell itself, not just in the LED or driver. The cell's internal resistance rises as temperature climbs, which accelerates voltage drop and can trigger the driver's thermal stepdown before the battery indicator reads low. This is normal behaviour — it means the protection circuit is working, not that the cell is failing.

Flashlight dropping to a lower mode on its own before the indicator reads low

This is driver brownout protection stepping down output to prevent a full cutoff. It triggers when cell voltage sags below the driver's threshold under load — typically around 3.0V under draw — even if the resting voltage still reads higher. A battery with significant cycle wear will sag earlier and harder under turbo load than a fresh cell, causing the stepdown to kick in sooner each charge cycle. If stepdown is occurring earlier than expected, check resting voltage after a full charge with a multimeter — a healthy cell should read 4.18–4.20V at full charge.