14.8V 3000mAh Li-ion Compatible Battery Pack 4INR/19/66 4S1P

Custom Battery Packs 4INR/19/66 4S1P — 14.8V Li-ion Replacement Battery

This is a 14.8V, 3000mAh (44.4Wh) Li-ion replacement pack built to the 4S1P cell configuration — four cells in series, one parallel string. It matches the OEM part number 4INR/19/66 4S1P. The pack suits portable computing or professional equipment that originally shipped with this exact configuration and voltage rail.

• 4S1P voltage rail match: Devices specced around this configuration expect a nominal 14.8V supply with a charge ceiling near 16.8V. Any variation outside that window triggers the host device's voltage range check and the pack gets rejected before first use. This replacement holds the same nominal and peak voltages as the original.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a bench load, monitoring BMS cutoff thresholds at both ends. The protection circuit tripped correctly at the low-voltage cutoff and did not allow overcharge past 16.8V.
• Fuel gauge calibration after swap: After installing, run one full charge-discharge cycle before trusting the capacity indicator. Integrated fuel gauges track coulombs against a baseline tied to the old cells — one full cycle recalibrates the gauge against the new pack's actual capacity.

Pack not accepted by device after swap

Some host devices run a voltage range check on startup before allowing the pack to discharge. If the replacement arrives at storage voltage — typically around 11V to 12V for a 4S Li-ion pack — it may fall outside the device's accepted input window. The fix is straightforward: connect the pack to a compatible charger first, bring it to at least 80% charge, then install it into the device. Most devices accept the pack immediately once it clears the minimum voltage threshold, usually around 14.4V.

Pack not reaching full charge on first cycle

On a fresh pack, the charge IC often limits current during the first cycle as a conditioning step — this is normal behaviour, not a fault. The result is that the first charge terminates earlier than expected and the reported capacity reads lower than 3000mAh. A second full charge-discharge cycle clears this. After two cycles, the charge IC lifts the current restriction and the pack charges to its full 44.4Wh capacity.