About this replacement
Custom Battery Pack OEM-130 — 1.2V Ni-MH Replacement Battery
This is a 1.2V, 2000mAh Ni-MH replacement battery pack for the OEM-130 platform. It matches the original cell chemistry and voltage rail so the host device accepts it without modification. Capacity is rated at 2000mAh (2.4Wh) as specified in the product data.
- OEM-130 platform fit: Ni-MH cells at 1.2V nominal match the charge curve the OEM-130 charge controller expects. Swapping to a different chemistry or voltage would push the charge IC outside its operating range — this pack stays within spec.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the bench. The BMS accepted the cells without triggering a protection cutoff, and voltage held steady through the discharge curve with no unexpected sag events.
- First-cycle calibration on the OEM-130: After swapping this pack in, run one complete charge-discharge cycle before trusting any capacity indicator. The OEM-130's fuel gauge recalibrates against the new cells during that first cycle — skipping it leaves the indicator reading against stale data from the old pack.
Pack running below rated voltage on first use
Ni-MH packs ship at storage voltage, which sits below the 1.2V nominal figure. A freshly installed pack can read as low as 1.0V per cell until it takes its first full charge. This is not a fault — it is the resting state after long shelf storage. Charge the pack fully before drawing any load, and the voltage will rise to nominal.
Pack not reaching full charge on the first cycle
On the first charge cycle, the charge IC often limits current while it characterises the new cells. This can make the pack appear to stop short of full capacity. The behaviour clears after one complete cycle as the charger builds an accurate picture of the cells' impedance. If the pack still falls short after two full cycles, check that the charge contacts on the OEM-130 are clean and making solid contact — resistance at the connector reduces charge current and extends fill time.