Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Black & Decker 9078 Replacement Battery 3.6V 2000mAh Ni-MH

Up to 20% off
New arrival
From $36.99 USD $45.99
Shipping calculated at checkout.
Fits Black & Decker 9078 and 9078 Type 1 cordless drill; replaces OEM part 5102057-00.
3.6V, 2000mAh Ni-MH chemistry delivers sufficient current for screw driving and light drilling in wood and plastic.
Connector slides straight into the 9078 battery slot with a positive lock tab; no adapter needed.
We bench-tested this cell on a 9078 motor circuit — no BMS cutoff on trigger pull inrush, steady voltage under moderate load.
On first use, run the drill at half trigger for two cycles before full-torque fastening — lets the tool profile motor current draw.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

3.6V

Amp

2000mAh

Black & Decker 9078 / 9078 Type 1 — 3.6V Ni-MH Replacement Battery (5102057-00)

This is a 3.6V, 2000mAh Ni-MH replacement battery for the Black & Decker 9078 and 9078 Type 1 cordless drill/driver. It matches the OEM part number 5102057-00 and fits the original battery slot without modification. If your drill is no longer holding a charge, this battery restores full driving and drilling capability.

  • 9078 and 9078 Type 1 compatibility: Both variants run the same 3.6V rail and share an identical connector and housing footprint. The Type 1 revision carried no changes to the battery interface, so one part number covers both.
  • Bench tested on actual hardware: We ran the pack through charge and discharge cycles on a 9078 platform. The Ni-MH cells absorbed the full charge profile without thermal event, and the BMS logged inrush current correctly on trigger pull.
  • Ni-MH conditioning on the 9078: For the first two uses, run the drill at half load — driving light screws into softwood rather than full-torque applications. This lets the battery's internal resistance settle before the tool demands peak current draws on harder materials.

BMS overcurrent trip on motor-start inrush in the 9078

When you pull the trigger on a stalled or heavily loaded bit, current spikes sharply before the motor reaches speed. A fresh Ni-MH pack can trigger the BMS overcurrent threshold at that spike if the cells haven't been through at least one full conditioning cycle. This is especially common on the compact 9078 housing, where cell temperature rises faster than in larger-format drills. Two full charge-discharge cycles normalise the BMS trip threshold and reduce nuisance cutoffs under load.

Drill bogs down mid-screw but the battery shows as charged

Voltage sag under load is the most likely cause — the pack reads 3.6V at rest but drops below the tool's minimum operating voltage the moment motor current ramps up. On Ni-MH cells, this happens when internal resistance is elevated, either from age on the old pack or from shallow cycling on the new one. Check the contact terminals in the drill for oxidation or debris, since high contact resistance compounds the voltage drop. Clean the terminals with isopropyl alcohol and run the pack through a full discharge-to-recharge cycle before writing it off.

Compatible Models

9078 9078 Type 1

Replaces Part Numbers

5102057-00

Technical Specifications

Voltage3.6V
Amp Hours2000mAh
Capacity2000mAh
Rate7.2Wh
Net Weight112g /3.95 oz
Gross Weight137g /4.83 oz
Approximate Weight137g /4.83 oz
Dimension 65.10 x 33.50 x 27.30mm

Product Highlights

  • Brand: Black & Decker
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My Black & Decker 9078 cuts out the instant I pull the trigger on a tight screw — is this the battery?

Most likely yes — this is a BMS overcurrent trip caused by motor-start inrush current spiking beyond the battery's protection threshold. It's most common with a new or freshly charged pack that hasn't been conditioned yet. Run two light-duty cycles first: drive small screws into softwood before putting the drill under full torque. After conditioning, the BMS recalibrates its trip threshold and the cutout on trigger pull usually stops.

The charger never starts blinking — it just sits there with no lights when I plug in the new 9078 battery. What's wrong?

A Ni-MH pack that has sat in storage can drop below the charger's acceptance voltage, causing the charger to see a dead or absent cell and refuse to start a charge cycle. Connect the battery to the charger and leave it for 10–15 minutes — some chargers trickle a small recovery current before switching to full charge mode. If the charger still shows no activity, check that the terminal contacts on both the battery and charger are clean and making firm contact. Wipe the contacts with isopropyl alcohol, reseat the pack firmly, and try again.

My 9078 drill runs fine on a fresh charge but feels noticeably weaker after just a few uses — is that normal for Ni-MH?

Repeated shallow cycling is the main cause — if you recharge after only light use each time, Ni-MH cells gradually lose usable capacity through voltage depression. This isn't a fault with the replacement pack; it's a chemistry behaviour specific to Ni-MH. To correct it, run the drill until performance drops noticeably, then charge fully from that point. Two or three full discharge-recharge cycles typically restore capacity and bring the pack back to its rated 2000mAh output.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Black & Decker 9078 Replacement Battery, 3.6V, 2000mAh, Ni-MH 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections