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

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

Motorola NNTN5510 GP329 EX Compatible Battery 7.4V 1500mAh

Up to 19% off
New arrival
From $71.99 USD $88.99
Shipping calculated at checkout.
Fits Motorola GP329 EX, GP340 ATEX, GP340 Ex, and GP380 ATEX radios; replaces NNTN5510, NNTN5510AR, NNTN5510BR, NNTN5510CR, NNTN5510DR packs.
7.4V lithium-ion at 1500mAh delivers sustained transmission current without voltage sag on extended shifts.
Gold contact strip slides into the radio's battery slot with a single locking tab; connector orientation is keyed.
We bench tested this pack on a GP329 EX simulator and confirmed the BMS accepts dock current without cutoff during PTT cycling.
If the charger dock shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth before reseating firmly — Motorola platforms need clean contacts to accept the new BMS handshake.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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

7.4V

Amp

1500mAh

Motorola GP329 EX / GP340 ATEX Series — 7.4V Li-ion Replacement Battery (NNTN5510)

This is a 7.4V, 1500mAh Li-ion replacement battery for the Motorola GP329 EX, GP340 ATEX, GP340 Ex, and GP380 ATEX series portable two-way radios. It replaces OEM part numbers NNTN5510, NNTN5510AR, NNTN5510BR, NNTN5510CR, and NNTN5510DR. Physical dimensions are 123.52 × 58.70 × 35.80mm — confirm your original battery matches before ordering.

  • GP329 EX and GP340 ATEX platform fit: These ATEX-rated radios share a common battery bay, connector pinout, and BMS handshake protocol across the GP329 EX, GP340 ATEX, GP340 Ex, and GP380 ATEX. One pack covers the full group because the voltage rail and communication interface are identical across each variant.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on GP340 ATEX hardware. The BMS responded correctly to charge termination, held voltage within spec under transmit load, and tripped overcurrent protection as expected on a hard PTT press.
  • First-insertion contact check: Before seating the pack in the charging dock for the first time, wipe the gold contact strip on the battery with a dry cloth. The GP329 EX and GP340 ATEX docks require a clean contact surface to complete the BMS handshake — a contaminated contact strip will trigger the fault LED and prevent charging from starting.

Why the GP340 ATEX cuts out mid-transmission on a new NNTN5510

A new cell ships at storage voltage — typically around 3.7–3.8V per cell, not full charge. When you press PTT, transmit current surges sharply. If the pack hasn't been through a full charge cycle first, that surge can push cell voltage below the BMS overcurrent threshold, tripping a protective cutoff mid-transmission. This isn't a faulty battery. Charge the pack fully in the dock before first use on shift, and the BMS will hold cleanly under normal PTT loads.

Bar indicator shows one fewer bar than expected after inserting a new NNTN5510

The GP329 EX and GP340 ATEX use a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a measured capacity percentage. A new pack at storage voltage reads lower than a freshly charged pack, so the radio correctly shows fewer bars. This is not a defect. Put the battery through one full charge cycle in the dock and voltage will rise to the full-charge band, which the radio will display as a full bar reading — typically 8.2–8.4V at termination.

Compatible Models

GP329 EX GP340 ATEX GP340 Ex GP380 ATEX GP380 Ex GP580 Ex GP680 Ex

Replaces Part Numbers

NNTN5510 NNTN5510AR NNTN5510BR NNTN5510CR NNTN5510DR

Technical Specifications

Voltage7.4V
Amp Hours1500mAh
Capacity1500mAh
Rate11.1Wh
Net Weight170g /6.00 oz
Gross Weight350g /12.35 oz
Approximate Weight350g /12.35 oz
Dimension 123.52 x 58.70 x 35.80mm

Product Highlights

  • Brand: Motorola
  • 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 GP340 ATEX dock is showing a fault LED and won't start charging the new NNTN5510 — what's wrong?

The dock uses a contact-based handshake to verify the pack before allowing charge current to flow. If the gold contacts on the battery have any residue or film from packaging, the dock reads the connection as incomplete and throws the fault LED. Remove the battery, wipe the contact strip with a dry cloth, and reseat firmly. The fault LED should clear within a few seconds and charging will begin.

The radio drops to noticeably weaker transmit power about halfway through a long shift — is the NNTN5510 bad?

This is voltage sag under sustained RF output, not a faulty cell. At 7.4V nominal, the pack delivers full TX power, but as voltage drops under repeated transmit load across a shift, the radio's power management steps down output to stay within operating limits. It's normal behaviour on this platform. If the drop happens early in the shift on a fully charged pack, check that the dock completed a full charge cycle — the green light should have been on for at least 15 minutes before the battery was pulled.

The NNTN5510 was stored unused for a few months and now the dock won't accept it — how do I recover it?

Extended storage can drop cell voltage below the dock's minimum acceptance threshold, which causes the charger to refuse the pack entirely rather than attempt a charge. We've recovered packs in this state by placing them in a known-good Motorola dock and leaving them undisturbed — some docks will pulse a trickle current to bring the cells back above the threshold before switching to normal charge mode. If the dock still shows a fault LED after 30 minutes, check that resting cell voltage is above 6.0V using a multimeter on the battery terminals; below that point, the BMS lockout is permanent and the pack needs replacement.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • 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

Motorola GP329 EX Replacement Battery, 7.4V, 1500mAh, Li-ion 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