Ledlenser H7 SE Replacement Battery 3.7V 2000mAh 603040

Ledlenser H7 SE / H7R Series — 3.7V Li-ion Replacement Battery (603040)

This is a 3.7V, 2000mAh (7.4Wh) lithium-ion cell built to OEM part number 603040. It fits the Ledlenser H7 SE, H7R, H7R CR, and H7R SE headlamps. When the original cell degrades and the headlamp dims early or fails to hold charge, this is the direct swap.

• H7 SE and H7R series fit: These models share the same battery bay dimensions and 3.7V single-cell driver circuit. The connector pinout and BMS handshake are consistent across the H7R, H7R CR, and H7R SE variants, so one cell covers the range.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the H7R platform. The BMS accepted charge without fault flags, and the driver held regulated output through to its low-voltage cutoff without false trips.
• Turbo mode draw on the H7R SE: The H7R SE's turbo mode pulls significantly more current than its standard or low modes. Running continuous turbo on an aging or partially charged cell trips the driver's brownout protection early. Keep the cell topped up if you plan to use turbo — a cell sitting at 50% will step down output well before the indicator warns you.

H7R headlamp dimming before the battery indicator drops

The H7R driver uses a regulated circuit that maintains constant brightness until the cell voltage falls below its brownout threshold — typically around 3.0V. At that point, the driver steps output down rather than cutting out entirely. This is intentional protection, not a fault. If you're seeing step-downs earlier than expected, the cell's internal resistance has risen from cycle wear. Replace the cell when step-down occurs at more than half the expected charge level.

Headlamp flickering or cycling through modes at end of charge

If the H7R SE cycles through brightness modes on its own or flickers near the end of a charge, the driver is brownout-cycling — the cell voltage is dropping below the regulation floor under load, then recovering when the driver backs off. This is a sign the cell can no longer sustain load at that output level. Switching to a lower mode stops the cycling immediately. A fresh 3.7V cell holding above 3.2V under load eliminates the fault entirely.