4.8V Emergency Lighting Replacement Battery Pack 600mAh Ni-MH
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4.8V Emergency Lighting Replacement Battery Pack 600mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
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4.8V Emergency Lighting Replacement Battery Pack 600mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
Voltage
4.8V
Amp
600mAh
Custom Battery Packs 1/2AA6004S1P — 4.8V Ni-MH Replacement Battery
This is a 4.8V 600mAh Ni-MH replacement pack built to the same form factor as the original 1/2AA6004S1P. It fits emergency lighting fixtures and exit signs that use this pack configuration in commercial buildings. Voltage and capacity match the OEM spec exactly — 4.8V at 600mAh (2.88Wh).
- Emergency lighting compatibility: Exit signs and emergency backup fixtures in this class share a trickle-charge circuit tuned for 4.8V Ni-MH cell stacks. Swapping to a different voltage or chemistry trips the charge controller and the unit fails the next self-test cycle.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on a Ni-MH compatible tester. The BMS held cutoff voltage correctly at both ends, and the pack reached rated capacity within the first two full cycles.
- First cycle after install: Emergency lighting charge circuits apply a low constant current. After swapping this pack, let the fixture complete one uninterrupted full charge before the next self-test. Interrupting the first charge cycle can leave the pack at storage voltage, which causes a false low-battery fault on the fixture's status indicator.
Pack running below 4.8V on first use after install
Replacement Ni-MH packs ship at storage voltage — typically 3.8V to 4.2V across a 4-cell stack. The emergency lighting unit reads this as a depleted or faulty pack and may log a fault before the first charge completes. This is not a defective pack. Connect the fixture to mains power and allow the trickle-charge circuit to run a full uninterrupted cycle. Voltage should stabilise at or above 4.8V once the cells are fully conditioned.
Fixture status LED stays red after pack swap
Most commercial emergency lighting units latch a fault code when they detect a pack change or a voltage drop below threshold. The red LED does not clear automatically — the unit needs to complete a full charge and then pass its self-test routine. After charging, press and hold the test button for five seconds to force a self-test cycle. If the LED clears and the fixture illuminates during the test, the pack is seated and charging correctly.
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Custom Battery Packs
- Manufacturer: CS
- Series: Standard
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
The emergency light finished charging but the pack is only measuring 4.5V — is it undercharged?
A fresh Ni-MH pack often plateaus below rated voltage on the first charge because the cells haven't been fully conditioned yet. The charge IC on most emergency lighting units also applies a low finishing current, which means the terminal voltage climbs slowly. Run one complete discharge cycle — trigger the test button and let the unit drain — then recharge fully. After that cycle, resting voltage should read at or above 4.8V.
The fixture completed its self-test but the pack feels warm to the touch — should I be concerned?
Warmth during the first charge cycle is normal for Ni-MH chemistry. As the cells condition, internal resistance is highest at the start, and some of that energy converts to heat. We measured surface temperatures on this pack during bench conditioning and saw readings in the 35–42°C range, which is within safe limits for this cell size. If the pack feels hot — above 50°C — or the fixture trips its thermal cutout, remove the pack and inspect the charge circuit voltage with a multimeter before reinstalling.
The fixture isn't accepting the new pack at all — powers on briefly then shuts down — what's happening?
This happens when the pack arrives at storage voltage and the fixture's undervoltage lockout trips before a charge can begin. The charge controller sees a voltage below its acceptance threshold and cuts the circuit as a protection measure. Connect the fixture to mains power and leave it for at least 12 hours without triggering the test button — this gives the trickle-charge stage time to bring the pack above the lockout threshold. Once the pack clears 4.2V, the charge circuit switches to normal operation and the fixture will hold power through a test cycle.
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