About this replacement
Stripelight FRT-EX / FRT-L1 / FRT-RS — 7.4V Li-ion Replacement Battery (FRT-BAT-EX2)
This is the 7.4V 2600mAh (19.24Wh) lithium-ion replacement battery for the Stripelight FRT-EX, FRT-L1, and FRT-RS tactical flashlights. It replaces OEM part FRT-BAT-EX2 directly. Same voltage, same capacity, same form factor — 66.80 × 37.00 × 20.00mm.
- FRT-EX, FRT-L1, and FRT-RS compatibility: All three models share the same 7.4V dual-cell battery format, connector pinout, and driver BMS handshake. The battery communicates cell voltage directly to each light's driver board, so a matching replacement is required for the driver to accept the pack and step through modes correctly.
- Bench tested on actual hardware: We cycled this battery through full charge and discharge on a FRT-series light, confirming the BMS held a stable cutoff at low voltage and the driver stepped down output correctly without false low-battery triggering at mid-charge.
- Multi-cell replacement timing: This is a two-cell 7.4V pack. If you run one replacement alongside an older degraded pack in a dual-battery setup, the weaker pack drains first and the stronger one pushes current through it under high-draw modes. Replace both packs at the same time from the same batch.
Turbo mode cutting battery life significantly faster than standard mode
Turbo mode on FRT-series lights pulls 5–10× more current than standard output. A 2600mAh pack that runs several hours on standard mode will deplete substantially faster on turbo — this is normal driver behaviour, not a battery fault. The driver draws what the LED array demands, and turbo mode pushes the LED to its thermal ceiling. If turbo runtime feels short on a new replacement, run the light on high or medium for your primary tasks and drop to turbo only when needed.
Flashlight steps down output before the battery indicator shows low
The FRT driver board monitors cell voltage continuously and steps output down once voltage drops below the brownout threshold — typically around 6.8–7.0V on a 7.4V pack. This happens before the indicator LED registers "low" because the indicator threshold is set slightly lower to avoid false warnings during normal use. If your light dims noticeably but the indicator stays green, the battery is approaching end-of-charge, not faulty. Switch to a lower output mode or recharge at that point — do not force it back to turbo, as the driver will step down again immediately.