Makita 1420 14.4V Ni-MH Cordless Drill Replacement Battery
Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.
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Makita 1420 14.4V Ni-MH Cordless Drill Replacement Battery - 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
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Makita 1420 14.4V Ni-MH Cordless Drill Replacement Battery - is backordered and will ship as soon as it is back in stock.
Voltage
14.4V
Amp
2000mAh
Makita 1051D Series — 14.4V Ni-MH Replacement Battery (1420)
This is a 14.4V 2000mAh Ni-MH replacement battery for the Makita 1051D cordless drill/driver and over 70 compatible models in the same platform. It slots into the same battery bay as the original pack and draws from the same cell chemistry. Capacity is 2000mAh (28.8Wh), sourced to match OEM specification.
- 1051D platform compatibility: The 1051D, 1051DWA, 1051DWAE, and 1051DWD all share the same 14.4V rail, slide-in connector, and BMS handshake protocol. Any pack carrying OEM part numbers 1420, 1422, or 192600-1 will communicate correctly with the onboard electronics without triggering a tool lockout.
- Bench tested on actual hardware: We cycled this pack through repeated trigger-pull events on a 1051D to confirm the BMS handled motor-start inrush current without tripping overcurrent protection. Cell temperature stayed within normal range across a full discharge cycle under intermittent drilling load.
- Break-in load cycling for the 1051D: On first use, run the drill at half load — light screwdriving, no hard boring — for two full cycles before moving to full-torque applications. This lets the BMS log the inrush draw of your specific motor before locking in its overcurrent thresholds.
BMS cutoff on the 1051D motor-start inrush surge
When you pull the trigger on a cordless drill, the motor draws a sharp current spike before it reaches running speed. On a new or cold Ni-MH pack, this inrush can briefly exceed the BMS overcurrent threshold — causing an immediate cutoff that looks like a dead battery. The BMS resets within seconds, so a short pause before re-triggering usually clears it. Running two break-in cycles at light load trains the BMS to expect that spike and sets a more accurate threshold.
1051D charger not responding to a new pack that sat in storage
Ni-MH cells that sit unused for several months can self-discharge below the voltage floor that Makita chargers use as an acceptance threshold. The charger sees a reading below roughly 10V across the pack and refuses to start a charge cycle, often showing no indicator light at all. A short "trickle prime" — if your charger supports it — or a brief boost from a compatible Ni-MH charger set to manual mode can bring the pack back above the acceptance threshold. Once cells read above 12V, the standard Makita charger will recognise the pack and begin a normal charge cycle.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Makita
- Manufacturer: CS
- Series: Standard
- Color: Red
- Product Type: Ni-MH
- Battery Type: Ni-MH
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My 1051D cuts out the instant I pull the trigger on a tough bit — is this the battery or the tool?
That's a BMS overcurrent trip, not a tool fault. The motor-start inrush current on a loaded drill hits a sharp spike, and a new or cold Ni-MH pack can have a BMS threshold set too conservatively to pass it. Wait three seconds after the cutout and try again — the BMS resets quickly. If it persists, run two light-load cycles first to let the BMS calibrate its overcurrent window to your motor's actual inrush draw.
The drill bogs down and loses torque partway through a long hole — charged pack, no cutout, just weak power.
That's voltage sag under sustained load, not a charge issue. As current demand stays high across a long bore, internal resistance in aging or cold Ni-MH cells causes the pack voltage to droop, and the tool's electronics throttle output to compensate. Check that the battery contacts in the tool bay are clean and making firm contact — corroded or loose contacts add resistance and make sag worse. If the contacts are clean and sag continues after a full charge, the pack cells are fatiguing and the replacement pack will restore normal torque output.
My Makita 1051D ran fine in summer but feels noticeably underpowered in a cold garage — same battery, same jobs.
Ni-MH internal resistance rises significantly below 5°C, which reduces the current the pack can deliver at working voltage. The tool isn't faulty and the pack isn't failing — cold cells simply can't sustain the same current output. Bring the pack indoors for 20–30 minutes before use; once cell temperature rises above 10°C, internal resistance drops back into the normal operating range and full torque returns.
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