Ledlenser H19R Signature 7.4V 5000mAh Replacement Battery

Ledlenser H19R Signature / H15R Core / H19R Core — 7.4V Li-ion Replacement Battery (502310)

This 7.4V 5000mAh Li-ion battery replaces OEM part 502310 in the Ledlenser H19R Signature, H15R Core, and H19R Core headlamps. All three headlamps share the same battery bay dimensions and voltage rail, so one part number covers the full group. Capacity is 5000mAh (37Wh) — matching the original specification exactly.

• H19R Signature, H15R Core, H19R Core compatibility: All three models run the same 7.4V dual-cell pack with an identical connector and BMS handshake protocol. The driver circuit in each headlamp reads cell voltage directly from the pack — the BMS on this replacement communicates the same data the driver expects.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the H19R Signature driver board. The BMS reported cell voltage correctly at each mode step, and the driver held turbo output until the pack hit its low-voltage cutoff threshold without premature step-down.
• Multi-mode thermal management: The H19R Signature's turbo mode pulls significantly higher current than mid or low modes. If you run extended turbo sessions, allow the pack a short rest between cycles — sustained high-current draw accelerates cell temperature, and the BMS will cut output before the indicator warns you.

Why the H19R Signature steps down output before the battery indicator hits red

The H19R Signature's driver monitors cell voltage on a millisecond cycle, not the fuel gauge display. When voltage sags under high-current draw — particularly in turbo mode — the driver steps output down to protect the cells before the indicator registers low. This is brownout protection, not a fault. The indicator reflects average state-of-charge, while the driver reacts to instantaneous voltage. If you see step-downs mid-session with a charge showing, switch to a lower mode to let cell voltage recover.

Battery draining noticeably faster in turbo than the indicator suggests it should

Turbo mode on the H19R Signature draws five to ten times the current of standard mode. The battery indicator is calibrated on a capacity curve, not real-time current draw, so it underestimates depletion speed at peak output. Under sustained turbo load, the cells hit the BMS low-voltage threshold well before the indicator predicts. To match runtime to what the indicator shows, use turbo in short bursts and return to high or mid mode — the pack voltage stabilises above 6.8V and the driver holds full output.