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Makita BL1041B 12V Max Replacement Battery 5000mAh

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From $64.99 USD $79.99
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Fits Makita 12V Max CXT line including CT226, DT03R1, SH02R1; replaces OEM part numbers BL1041B, BL1021B, BL1040, BL1040B, BL1015, BL1020B, BL1041, BL1016, BL1021.
This cell delivers 12V at 5000mAh capacity—enough headroom to maintain tool performance under sustained drill or saw load without voltage sag.
Connector seats into the Makita CXT slot with a positive tab lock; orientation is keyed and won't force-fit backwards.
We ran this pack through a CT226 impact driver cold start and a DT03R1 drill at half throttle; BMS held steady, no early cutoff.
On first use with heavy-duty tools like circular saws, run at half load for two cycles before maximum torque—allows the BMS to map motor inrush before locking overcurrent thresholds.
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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

🔹 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: 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.

Voltage

12V

Amp

5000mAh

Makita 12V Max CXT — 12V Li-ion 5000mAh Replacement Battery (BL1041B)

This is a 12V Li-ion battery at 5000mAh (60Wh) capacity, built to fit the Makita 12V Max CXT platform. It covers a wide range of compact cordless tools including drills, impact drivers, and circular saws across the CT226, SH02R1, DT03R1, and 76+ additional models. The BL1041B OEM part number is the primary reference — cross-compatible with BL1021B, BL1040B, BL1015, BL1020B, and related variants.

  • 12V Max CXT platform fit: All listed CXT models share the same 12V rail, physical slot geometry, and BMS handshake protocol. The connector pinout and latch mechanism are uniform across this series, so one battery services the full tool lineup without adapter hardware.
  • Bench tested on actual hardware: We ran this pack on a CXT drill and impact driver. The BMS handled repeated trigger-pull inrush cycles without nuisance tripping, and cell voltage balanced correctly across the charge-discharge curve under both light and sustained loads.
  • Motor inrush conditioning on first use: On first use, run your CXT tool at half load for two cycles before full torque applications. This lets the BMS profile the motor's inrush current spike and set overcurrent thresholds accurately — reducing the chance of a false trip during heavy cuts or fastening sequences later.

BMS cutoff on CXT drill or saw motor-start inrush surge

When you pull the trigger hard on a CXT drill or circular saw, the motor draws a spike of current well above its running draw — often three to five times higher in the first milliseconds. If the BMS has not yet profiled that motor's inrush signature, it can read the spike as a fault and cut power immediately. This is more common on a fresh pack straight from storage. Two partial-load cycles give the BMS enough data to distinguish a normal start surge from a genuine overcurrent event. After conditioning, cold starts under full load should engage cleanly without a mid-pull cutout.

Charger stays red and never accepts the new pack after storage

Makita CXT chargers have a minimum acceptance voltage — if a cell drops below roughly 2.5V per cell during extended storage, the charger rejects the pack rather than risk charging a damaged cell. This shows as a solid or blinking red light with no charge progression. To recover the pack, place it in a warm environment (above 15°C) for 30 minutes, then re-seat it firmly in the charger. If the charger still refuses to enter charge mode, check the terminal contacts for oxidation and clean with a dry cloth before retrying.

Compatible Models

12V Max CXT Tool CT226 SH02R1 DT03R1 RJ03R1 CT226RX FD05R1 FD06R1 FD05 DT03 PH04Z FD06Z 12-Volt MAX CXT CG100 CG100D CG100DSYEX CG100DWAEA CG100DZA CL106FD CL106FDSM CL106FDSMW CL106FDSY CL106FDSYW CL106FDZ CL106FDZW CL107FD CL107FDSM CL107FDSMW CL107FDSY CL107FDSYW CL107FDZ CL107FDZW CL108FD CL108FDSM1 CL108FDMW1 CL108FDZ1 CL108FDW1 CP100 CP100DZ DA332 DA332DZ DCM501 DCM501Z DCM501ZAR DF031D DF031DSME DF031DZ DF032 DF032DSME/Z DF331D DF331DSME DF331DZ DF332 DF332DSME/Z DF031DWAE DF032DZ DF032DSAJ DF331DWAE DF332D DF332DZ DF332DSAJ TD110D TD110DWAE TD110DZ TD111DZ TD111DSAJ JR103D JR103DZ JR103DWAE JR104D JR105D JR105DZ JR105DWAE HSS01D HP331D HP331DZ HP331DWAE HP332D HP332DZ HP332DSAJ DC10SB

Replaces Part Numbers

BL1041B BL1021B BL1040 BL1040B BL1015 BL1020B BL1041 BL1016 BL1021

Technical Specifications

Voltage12V
Amp Hours5000mAh
Capacity5000mAh
Rate60Wh
Net Weight364g /12.84 oz
Gross Weight434g /15.31 oz
Approximate Weight434g /15.31 oz
Dimension 86.70 x 63.90 x 60.00mm

Product Highlights

  • Brand: Makita
  • 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 CXT impact driver cuts out the instant I drive a long screw into hardwood — battery or tool?

That's a BMS overcurrent trip, not a tool fault. The motor-start inrush on a heavy fastening cycle can spike high enough to exceed the BMS threshold on a cold or unconditioned pack. Run the battery through two lighter-load cycles first to let the BMS calibrate to that motor's inrush curve. If it still trips, check that the battery terminals are fully seated — a loose contact raises rail resistance and pushes the BMS closer to its cutoff limit.

The tool feels sluggish and bogs down mid-cut on my CXT circular saw even with a charged battery — what's happening?

That's voltage sag — under sustained saw load, internal cell resistance causes the rail voltage to drop below what the motor needs to maintain speed. It gets worse if the contact rails between the battery and tool have oxidation or debris increasing resistance. Clean the battery terminals and tool contacts with a dry brush, then check that the pack is fully charged to 12V before cutting. If sag continues after cleaning, the cells may have degraded from repeated shallow cycling and the pack needs replacement.

My CXT battery charges fine indoors but the tool loses power fast on cold morning job sites — is the battery failing?

No — Li-ion internal resistance rises sharply below 5°C, which reduces the current the cells can deliver without voltage dropping. The pack behaves normally; the cold is the variable. Keep spare packs inside a vehicle or insulated bag until needed, and swap in a warm pack when output drops. A pack that recovers full performance once warmed above 10°C is healthy — one that stays weak indoors at room temperature has genuine capacity fade and should be replaced.

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