ESYLUX SLP-2 Replacement Battery 7.4V 2600mAh Li-ion

ESYLUX SLP-2 — 7.4V Li-ion Replacement Battery (EN10061127)

This is a 7.4V 2600mAh Li-ion replacement battery for the ESYLUX SLP-2 rechargeable flashlight. It fits the SLP-2 used in emergency lighting, search and rescue, and professional inspection work. Physical dimensions are 66.60 × 36.80 × 20.00mm — verify against your existing cell before ordering.

• SLP-2 fitment: The SLP-2 runs a two-cell 7.4V Li-ion pack that feeds directly into the driver board. The EN10061127 pack shares the same voltage rail, connector, and cell arrangement as the factory unit, so the driver BMS handshake completes without error codes on startup.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the SLP-2 platform. The BMS held cell balance across both cells throughout full discharge, and the protection circuit tripped correctly at the low-voltage cutoff before either cell dropped below safe floor voltage.
• Multi-cell replacement protocol: The SLP-2 uses a two-cell series pack. If one cell in your original pack has degraded more than the other, do not mix the old pack with the new one or swap individual cells. Replace the full pack as a unit — mismatched cell ages under high-current draw will cause the weaker cell to drain first and destabilise the pack.

SLP-2 driver stepping down brightness before the battery indicator reads low

The SLP-2 driver monitors pack voltage in real time, not just cell percentage. When voltage sags under load — typically below 6.8V on a 7.4V pack — the driver activates brownout protection and reduces output before the indicator LED signals low battery. This is intentional. The driver is protecting the emitter and the cells from a hard cutoff under draw. If your light dims noticeably but the indicator still reads partial charge, the pack is near end-of-life and holding surface voltage without load capacity.

Flashlight flickering or cycling through modes near end of charge

Mode cycling at low charge is a driver brownout loop — voltage drops below the driver's minimum threshold, the driver resets, briefly draws current again, and repeats. This is not a driver fault; it is the driver trying to restart as the pack voltage recovers slightly after each dropout. Switch the light to its lowest output mode immediately — lower current draw reduces voltage sag and stops the cycling. If cycling starts well before the indicator reads empty, the pack's internal resistance has increased and it can no longer deliver sufficient current at working voltage; replace the pack.