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

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

Brother BA-18R Replacement Battery 8.4V 700mAh Ni-MH

Up to 20% off
New arrival
From $33.99 USD $41.99
Shipping calculated at checkout.
Fits Brother PT-18R, PT-18RZ label makers; replaces BA-18R, BBP-18, LN6044001 batteries.
8.4V at 700mAh delivers stable thermal head voltage for consistent print darkness across label runs.
Connector slides straight in with locking tab seated flush; orientation marked on printer housing.
We ran full charge cycles on the PT-18R test unit; BMS accepted voltage profile without fault codes.
After installation, charge fully then print ten test labels at standard darkness before field deployment—thermal printer motor calibration requires current draw confirmation from new cell.
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

8.4V

Amp

700mAh

Brother PT-18R / PT-18RZ Series — 8.4V Ni-MH Replacement Battery (BA-18R)

This is an 8.4V, 700mAh Ni-MH replacement for the Brother BA-18R battery. It fits the PT-18R and PT-18RZ handheld label makers. The same cell also covers OEM references BBP-18 and LN6044001.

  • PT-18R and PT-18RZ compatibility: Both models run the same 8.4V rail and use identical connector geometry and BMS handshake. The PT-18RZ is the kit version — the battery is physically the same unit, so one SKU covers both.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on a PT-18R unit. The BMS held charge acceptance without fault and the thermal head voltage stayed stable across multiple label runs.
  • First-use print sequence: After installing this battery, charge it fully, then print five consecutive test labels before deploying the printer. The PT-18R's paper feed motor draws a short high-current pulse at start — running those test prints lets the BMS log the correct current profile for the new cell and prevents false low-battery cutoffs during real jobs.

Why the PT-18R stops printing after sitting unused for weeks

Ni-MH cells self-discharge faster than lithium chemistry — a PT-18R left on a shelf for three to four weeks can drop below the minimum motor drive voltage the printer needs to advance the tape. The printer powers on but the feed motor stalls, so no label comes out. This is not a fault with the printer or the battery. A full charge cycle before use clears it entirely.

Faded or uneven print density on a freshly installed battery

The PT-18R's thermal print head requires a stable voltage to heat evenly across its element width. If the battery cell voltage sags during the print cycle — common on a new Ni-MH cell that hasn't been conditioned yet — the head temperature varies between passes and characters print unevenly or lighter at one edge. Run two to three full charge-discharge cycles to let the cells reach full capacity. After conditioning, open voltage should read at or above 8.4V before the printer is powered on.

Compatible Models

PT-18R PT-18RZ PT18R PT18RKT

Replaces Part Numbers

BA-18R BBP-18 LN6044001

Technical Specifications

Voltage8.4V
Amp Hours700mAh
Capacity700mAh
Rate5.88Wh
Net Weight87.4g /3.08 oz
Gross Weight157.4g /5.55 oz
Approximate Weight157.4g /5.55 oz
Dimension 89.08 x 21.40 x 21.40mm

Product Highlights

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

Frequently Asked Questions

My PT-18R powers on but the tape won't feed — why does this happen with a new battery?

A new Ni-MH cell often sits below the motor drive threshold the PT-18R needs to run the feed motor, even if the power light comes on. The display draws very little current, so the printer appears functional, but the feed motor needs a higher sustained voltage to start. Charge the battery fully before the first use — a resting voltage below 8.0V won't drive the motor reliably. After a complete charge cycle, the feed should operate normally.

Print comes out faint on one side of every label — is that a head problem or a battery problem?

Uneven print density across the element width is almost always a voltage issue, not a head fault. The PT-18R thermal head heats unevenly when cell voltage sags mid-print, and new or under-conditioned Ni-MH cells sag more than broken-in ones. Run three full charge-discharge cycles to condition the cells to full rated capacity. After conditioning, check open-circuit voltage reads at or above 8.4V — fading on one side should clear up by the second or third cycle.

The PT-18R disconnects from the device mid-job and the battery indicator drops suddenly — what causes that?

The radio module in the PT-18R pulls a short current spike when it transmits label data, and a partially discharged or unconditioned Ni-MH cell can't sustain that spike without a momentary voltage drop. The BMS reads that drop as a low-battery event and cuts the connection to protect the cell. Charge the battery fully before a wireless job and avoid starting a long print run below 50% charge. If dropouts persist on a fully charged cell, run two conditioning cycles — capacity on a fresh Ni-MH cell builds over the first few full cycles.

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

Brother PT-18R Replacement Battery, 8.4V, 700mAh, 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