About this replacement
Busch-Jaeger 1519/01 Series — 3.6V Ni-MH Replacement Battery (2TKA00004530)
This is a 3.6V 700mAh Ni-MH rechargeable cell for the Busch-Jaeger 1519/01, 1519 U, and 9497320 emergency lighting units. It restores backup illumination function when the original cell no longer holds charge. Voltage and capacity match the OEM specification exactly.
- 1519/01, 1519 U, and 9497320 compatibility: These three fittings share the same charge controller circuit, connector pinout, and 3.6V NiMH float voltage. One cell covers all three variants without any wiring modification.
- Bench tested on actual hardware: We cycled this cell through charge and full-load discharge on a 3.6V NiMH controller. The BMS accepted the cell on first connection, floated correctly at full charge, and held stable voltage under load throughout the test cycle.
- First-cycle commissioning on a live fitting: After installing the new cell, hold the test button for the full rated duration within 24 hours. This confirms the cell accepts load and lets the charge controller register the new capacity before the next scheduled compliance test.
Charge indicator staying red after new battery installation
A replacement NiMH cell shipped from storage typically arrives at a reduced state of charge — often below the float acceptance window the 1519/01 charge controller expects. The controller interprets this as a fault condition and holds the red indicator. This is not a faulty cell or a faulty fitting. Leave the fitting connected to mains for a full 24-hour charge cycle and the indicator will shift to green once the cell voltage climbs into the acceptance band above 3.6V.
Emergency light dims or cuts short during a duration test
If the light fades or shuts off before the rated duration on the first test after replacement, the cell has not completed an initial conditioning cycle. A new NiMH cell does not reach full capacity until it has been fully charged and then fully discharged at least once under real load. Run a full 24-hour mains charge first, then re-run the duration test. If the cell still falls short after two complete charge-discharge cycles, check the terminal voltage under load — it should hold above 3.0V for the full rated period.