About this replacement
Streamer YH11B-05WL Series — 6.4V LiFePO4 Replacement Battery (YHBAL2-1.6)
This is a 6.4V 1500mAh LiFePO4 replacement battery for the Streamer YH11B-05WL emergency lighting fixture. It fits the YH11B-05WL, YH11B-05WL-55, and YH11B-05WL-55 5W variants. The OEM part reference is YHBAL2-1.6.
- YH11B-05WL series compatibility: All three variants in this fitting family share the same 6.4V LiFePO4 voltage rail, connector footprint, and charge controller float threshold — this battery seats and communicates correctly across the entire series without modification.
- Bench tested on actual hardware: We cycled this cell through a simulated mains-fail event and confirmed the BMS released load current cleanly. The charge controller accepted the cell and transitioned from bulk charge to float without faulting.
- Post-installation test cycle: Within 24 hours of fitting, hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity and confirms the cell accepts load before your next scheduled compliance inspection.
Charge indicator staying red after new battery installation
LiFePO4 cells lose voltage during storage. If the resting cell voltage sits below the fitting's float acceptance window when first installed, the charge controller holds a fault state rather than entering normal charge mode. This is not a defective cell — it is a low starting voltage rejection by the controller. Leave the fitting powered on mains for 12 to 24 hours; the controller will slowly pull the cell voltage up until it crosses the acceptance threshold, typically around 6.0V to 6.2V, and the indicator will shift to green.
Emergency light fails its duration test after battery replacement
A freshly installed LiFePO4 cell has not yet completed a full conditioning cycle, so available capacity on the first test is lower than rated. This causes the fitting to cut out before the required duration elapses — triggering a compliance failure that is not a sign of a faulty battery. Run one complete manual test cycle immediately after installation and then allow a full 24-hour recharge before any recorded compliance test. After that first cycle, the cell delivers its rated 1500mAh and the fitting should hold illumination for the full required period.