Ridgid AC840084 18V Replacement Battery 2000mAh Li-ion

Ridgid 130383001 Series — 18V Li-ion 2000mAh Replacement Battery (AC840084)

This is an 18V lithium-ion replacement battery rated at 2000mAh (36Wh), built to the AC840084 specification. It fits Ridgid cordless drills, impact drivers, and handheld power tools across the 130383001, 130383025, 130383028, and R840084 model range. Voltage and connector match OEM — the tool's charger and BMS handshake as they would with the original pack.

• 130383001 series compatibility: These models share the same 18V rail, slide-mount connector format, and BMS communication protocol. A replacement pack at the correct voltage and cell configuration slots into the same charge and discharge cycle without modifications.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on an 18V Ridgid platform and monitored the BMS response across low, medium, and high draw events. Cell balancing held across all cycles and overcurrent protection triggered correctly at threshold.
• Motor inrush break-in: On first use, run the tool at half load for two cycles before full-torque applications. This lets the BMS log motor inrush current draw and calibrate its overcurrent thresholds before it sees a hard start spike from a drill bit under load.

BMS cutoff on 18V motor-start inrush surge

When you pull the trigger on a Ridgid drill under load, the motor draws a current spike in the first few milliseconds that can be several times the running draw. If the BMS has not profiled the tool's inrush signature — or if cell voltage is already low — it reads that spike as an overcurrent fault and cuts the output. This is a protection event, not a cell failure. To clear it, release the trigger fully, wait three seconds, and restart at low speed. If it trips repeatedly, check that the terminal contacts on the battery dock are clean and seated flush, since elevated contact resistance pushes the apparent draw higher than the actual motor load.

Charger not recognising a new pack after storage

Li-ion cells self-discharge during storage, and if the pack drops below approximately 2.5V per cell, most 18V chargers will not initiate a charge cycle — the charger reads the low voltage as a damaged or unsafe pack. This is common with new replacement batteries that have been warehouse-stored for several months. Some Ridgid chargers have a recovery or trickle mode — leave the pack seated for 10–15 minutes before removing it, as the charger may pulse a small current to lift the cells above the acceptance threshold. If the charger still rejects the pack, check that the cell voltage at the terminal is above 14V total before assuming the pack is faulty.