AEG L1815R 18V Cordless Drill Replacement Battery 1500mAh

AEG BFL 18 / BHO 18 / BKS 18 — 18V Li-ion Replacement Battery (L1815R / L1830R)

This is an 18V Li-ion replacement battery rated at 1500mAh (27Wh), built to the L1815R and L1830R OEM part numbers. It fits the AEG BFL 18 drill/driver and over a dozen other AEG 18V platform tools including the BHO 18, BKS 18, and BMS 18C. The connector and BMS handshake match the original AEG 18V slide-pack format exactly.

• AEG 18V platform fit: All listed models share the same 18V slide-rail connector and BMS communication protocol. The pack authenticates to each tool's controller the same way the factory battery does — no adapter, no workaround required.
• Bench tested on actual hardware: We cycled this pack through the AEG BFL 18 charger and ran trigger-pull load tests. The BMS held the 18V rail through multiple motor-start inrush events without tripping overcurrent protection at normal fastening torque.
• First-use break-in on AEG drill platforms: Run the BFL 18 or BKS 18 at half-load for the first two charge cycles before full-torque applications. This lets the BMS log actual motor inrush current and calibrate its overcurrent threshold before you hit the drill hard in masonry or hardwood.

BMS cutoff on AEG 18V motor-start inrush surge

Every time you pull the trigger on the BFL 18 or BKS 18, the motor draws a short inrush spike — often two to three times the steady-state current. A new pack with an uncalibrated BMS may read that spike as an overcurrent fault and shut the cell output down before the motor reaches speed. The fix is progressive load cycling: start at low torque and let the BMS log a few real inrush events before applying maximum load. After two or three full cycles, the protection threshold settles and the cutout behaviour stops.

AEG charger shows no charge light on pack from storage

If this pack has been stored for several months, cell voltage may have dropped below 12V — the minimum the AEG 18V charger needs to begin a charge cycle. The charger reads that as a fault condition and either blinks red or sits dark. Place the pack in the charger and leave it for 20–30 minutes without moving it — most AEG chargers run a trickle pre-charge at 100mA to lift the cell voltage back above the 12V acceptance threshold before switching to full charge. If the charger still shows no response after 30 minutes, check cell voltage at the pack terminals with a multimeter; anything below 10V across the pack indicates cell damage rather than a recoverable deep-discharge state.