Omniled 4.8V LED Work Light Replacement Battery 1500mAh

Omniled 2019 Onwards LED Light Series — 4.8V Ni-MH Replacement Battery

This is a 4.8V, 1500mAh Ni-MH rechargeable battery for Omniled portable LED lights manufactured from 2019 onwards, including models 138006, 138007, and 290061. It replaces the original cell pack when repeated charge cycles have degraded capacity. Voltage and cell chemistry match the stock specification exactly.

• 2019-onwards Omniled compatibility: These models share the same 4.8V four-cell Ni-MH pack configuration, connector pinout, and LED driver input range. Swapping to a mismatched voltage or chemistry causes the driver to underdrive the LEDs or refuse to power on entirely.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the 138006 platform. The BMS accepted full charge without interruption, and the LED driver held consistent current output across the discharge curve until the low-battery cutoff tripped.
• First-cycle brightness calibration: Run the light on medium brightness for the first full cycle after fitting this battery. The LED driver reads current draw against the new cell's output before you push it to maximum — skipping this step can result in inconsistent brightness in the first few hours of use.

LED work light dimming before the low-battery indicator activates

The LED driver in these Omniled units reduces current output before the BMS reaches its cutoff threshold. This is intentional — the driver begins pulling back power when cell voltage dips under load, protecting the cells from deep discharge. You see dimming first, then the indicator, then shutdown. This is normal behaviour and not a fault with the battery or the light.

Light not reaching full brightness after fitting the replacement battery

This happens when the battery arrives partially discharged from storage — the cell voltage is too low for the LED driver to operate at full current. The driver won't deliver maximum brightness until the pack is above approximately 5.4V (fully charged across all four cells). Charge the battery completely before the first use and re-test at maximum brightness. If the issue persists after a full charge, check the charge contacts for oxidation on the battery terminals.