AEG BS 18C Replacement Battery 18V 3000mAh L1815R
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AEG BS 18C Replacement Battery 18V 3000mAh L1815R - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
AEG BS 18C Replacement Battery 18V 3000mAh L1815R - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
3000mAh
AEG BS 18C / BKS 18 Series — 18V Li-ion Replacement Battery (L1830R)
This is an 18V 3000mAh Li-ion battery that fits the AEG BS 18C, BS 18G, BKS 18, BFL 18, and eleven additional AEG 18V cordless tools. It replaces OEM part numbers L1815R and L1830R. Voltage and cell chemistry match the original battery pack specification exactly.
- BS 18C, BS 18G, BKS 18, BFL 18 compatibility: These models share the same 18V slide-rail connector, BMS communication protocol, and charge management handshake. Any pack that meets the voltage rail and connector spec will operate across the full lineup without modification.
- Bench tested on actual hardware: We ran this pack through trigger-pull cycles on a BS 18C and monitored the BMS response to motor-start inrush current. The overcurrent protection threshold held correctly, and the pack did not trip or latch off during repeated cold-start pulls.
- First-use load conditioning: On first use, run the drill at half load — light drilling, no high-torque fastening — for the first two full charge cycles. This allows the BMS to profile the motor's inrush draw before it locks in its overcurrent protection thresholds for your specific tool.
BMS overcurrent trip on motor-start inrush in the BS 18C
When you pull the trigger on a cordless drill, the motor draws a spike of current before it reaches running speed — this inrush can be three to five times the steady-state draw. A new pack with a freshly calibrated BMS sometimes reads that spike as a fault and cuts power instantly. The fix is graduated load cycling during the first two uses, so the BMS records the normal inrush curve for your motor. After two cycles, the protection thresholds stabilise and nuisance trips stop.
Pack voltage drops below charger acceptance threshold after storage
Li-ion cells self-discharge during storage, and if the pack sits long enough, cell voltage can fall below the minimum the charger will accept — typically under 2.5V per cell. The charger blinks red or does nothing because it will not push charge into a pack it cannot verify as safe. To recover the pack, place it in the charger and leave it connected for up to 30 minutes — most AEG chargers run a trickle pre-charge routine that raises cell voltage to the acceptance threshold before switching to normal charge. If the charger still shows a fault after 30 minutes, check each cell group with a multimeter and confirm no individual cell has dropped below 2.0V.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: AEG
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My AEG BS 18C cuts out the instant I pull the trigger on a tough screw — why does it keep doing this?
That's a BMS overcurrent trip caused by motor-start inrush current. The spike when the motor kicks from zero speed can exceed the pack's protection threshold, especially on a new battery that hasn't profiled your tool yet. Run the drill on light-load tasks — small pilot holes, no hard fastening — for the first two full charge cycles so the BMS can set its inrush thresholds accurately. After that, cold-start trips on normal torque applications should stop.
The drill feels weak and bogs down halfway through a hole — the battery isn't dead, so what's wrong?
That's voltage sag, not capacity failure. Under sustained load, internal resistance in aged or poorly seated cells causes the rail voltage to drop, and the motor loses torque before the pack reaches its low-voltage cutoff. Check the slide-rail contacts on both the pack and the tool for corrosion or debris — dirty contacts add resistance and make sag worse. Clean the contacts with a dry brush, reseat the pack firmly, and retest; if the tool still bogs at the same load point, the cells are fatigued and the pack needs replacing.
My AEG charger does nothing when I plug in this new battery — no lights, no charge cycle starting. What's happening?
The pack's cell voltage has likely dropped below the charger's acceptance floor from storage — AEG chargers typically won't initiate a charge cycle below around 2.5V per cell. Leave the pack connected in the charger for up to 30 minutes; the charger runs a low-current pre-charge routine to bring the cells up to acceptance voltage before switching to the main charge cycle. If the charger still shows no activity or a solid red fault after 30 minutes, check individual cell groups with a multimeter — any cell reading below 2.0V indicates an unrecoverable cell and the pack should not be used.
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