About this replacement
Solar LED Light SL-24000 — 3.7V Li-Polymer Replacement Battery (24-800-002)
This 3.7V, 700mAh lithium-polymer cell replaces the original battery in the Solar LED Light SL-24000 fixture. It stores energy from the solar panel during daylight and delivers it to the LED driver at night. Also cross-references part numbers 24-800-006 and PLB-24-800-006.
- SL-24000 compatibility: The SL-24000 uses a low-voltage LED driver circuit matched to a single-cell 3.7V LiPo. Voltage, connector, and cell dimensions (49.20 × 30.00 × 4.90mm) all have to match — this cell meets all three. Substituting a different cell size can physically stress the housing and confuse the driver.
- Bench tested on actual hardware: We cycled this cell through solar-simulated charge and discharge on the SL-24000 circuit. The BMS held cutoff at the correct low-voltage threshold and accepted charge without triggering overcharge protection on either a full-sun or partial-sun input profile.
- First-cycle brightness calibration: Run the light on medium brightness for the first full charge-discharge cycle. This lets the LED driver calibrate current output against the new cell before you push it to maximum brightness operation.
Why the SL-24000 dims before the low-battery indicator activates
The LED driver in the SL-24000 begins stepping down current output before cell voltage reaches the BMS trip threshold — typically around 3.4V versus the 3.0V hard cutoff. This is a deliberate driver behaviour, not a fault with the battery. You will see visible dimming first, then the low-battery indicator, then shutdown in that sequence. Replacing the battery restores full brightness from the start of each cycle; the dimming sequence itself will still occur as cell voltage drops near end of discharge.
Light runs warm in the housing during extended use at full brightness
At maximum brightness, the LED and the discharging LiPo cell both generate heat inside a compact, enclosed housing. The SL-24000 housing has minimal airflow, so heat accumulates faster than it dissipates. If the housing feels hot to the touch during extended full-brightness operation, drop to medium brightness — this reduces both LED heat output and discharge current through the cell simultaneously. Sustained high temperatures shorten LiPo cycle life, so managing brightness is the most direct way to extend battery service life in this fixture.