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Motorola GP328 Plus JMNN4023 Li-ion Replacement Battery 7.4V

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New arrival
From $56.99 USD $69.99
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Fits Motorola GP328 Plus, GP329 Plus, GP338 Plus with OEM part numbers JMNN4023, JMNN4024, PMNN4023, PMNN4201Li, PMNN4022, PMNN4070.
Voltage 7.4V, capacity 2600mAh — matches original pack output and talk time per charge cycle.
Connector slides straight in with positive contact forward; locking tab seats flush against the radio frame.
We bench-tested this cell in a DP3000e charger dock; BMS accepted handshake on first insertion with clean gold contacts.
On first insertion into the dock, if the fault LED stays on, remove the battery and wipe the gold contact strip with a dry cloth before reseating — Motorola's BMS handshake requires a clean contact cycle to begin charging.
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
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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
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

7.4V

Amp

2600mAh

Motorola GP328 Plus / GP338 Plus Series — 7.4V Li-ion Replacement Battery (JMNN4023)

This 7.4V, 2600mAh Li-ion pack replaces the original battery in the Motorola GP328 Plus, GP329 Plus, GP338 Plus, GP344, and more than 20 compatible variants. It matches the OEM connector, contact strip, and BMS handshake profile the radio's charger dock expects. Capacity figure is taken from the product specification — 2600mAh / 19.24Wh.

  • GP300 Plus platform compatibility: The GP328 Plus, GP329 Plus, GP338 Plus, and GP344 share a common battery bay geometry and the same 7.4V rail. The charger dock authenticates through the gold contact strip, so connector alignment and BMS voltage thresholds must match — this pack meets both.
  • Bench tested on actual hardware: We ran this pack through a transmit-cycle load on the GP338 Plus bench unit. The BMS held the voltage rail steady through repeated PTT events and tripped the overcurrent protection cleanly at the expected threshold — no false lockouts recorded.
  • First-insertion contact cycle: If the charger dock shows a fault LED on the first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Motorola dock requires a clean contact surface to complete the BMS handshake before it will begin charging.

Why the GP328 Plus cuts out mid-transmission on a new battery

During transmit, the GP328 Plus draws a sharp current spike the moment PTT is pressed — RF output and the PA stage both pull from the same cell stack simultaneously. If the BMS reads that spike as an overcurrent event, it trips and drops the radio off-air for a split second. This usually happens when the pack is cold or has been sitting at storage voltage for an extended period. Let the pack complete one full charge cycle in the dock before field use — this brings the cell voltage up to the operating range where the BMS handles transmit spikes without tripping.

Bar indicator showing one fewer bar than expected on a new pack

The GP328 Plus uses a voltage-threshold bar indicator — each bar corresponds to a voltage band, not a calculated charge percentage. A new pack shipped at storage voltage (typically around 3.7V per cell) will read lower than a freshly charged pack, so the display may show one or two bars even though the cells are not depleted. This is not a cell fault. Seat the pack in the dock, allow a complete charge cycle until the dock LED goes solid green, then reinsert — the indicator will reflect the correct voltage level.

Compatible Models

GP328 Plus GP329 Plus GP338 Plus GP344 GP388 GP628 Plus GP638 Plus GP644 GP688 EX500 EX560 EX600 PRO5150 Elite GP329 Pro7150 Elite EX600XLS EX560XLS GL2000 PTX700 Plus PTX760 Plus Pro 5150 Elite EX560 XLS EX600 XLS PTX760

Replaces Part Numbers

JMNN4023 JMNN4023BR JMNN4024 JMNN4024AR JMNN4024CR PMNN4023 PMNN4201Li PMNN4022 PMNN4022AR PMNN4070

Technical Specifications

Voltage7.4V
Amp Hours2600mAh
Capacity2600mAh
Rate19.24Wh
Net Weight152g /5.36 oz
Gross Weight222g /7.83 oz
Approximate Weight222g /7.83 oz
Dimension 99.60 x 60.30 x 38.80mm

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

The charger dock LED keeps blinking red after I insert the new pack — it never switches to charging mode. What's wrong?

The Motorola dock requires the cell voltage to be above its acceptance threshold before it will initiate a charge cycle. A pack shipped at storage voltage can sit just below that threshold, causing the dock to reject it with a continuous blink rather than begin charging. Remove the pack, wipe all gold contacts on both the pack and the dock with a dry cloth, and reseat firmly. If the blink continues, try a different dock if available — dock contact corrosion is a common cause of persistent fault LED on the GP300 Plus platform.

The radio drops to noticeably weaker TX output partway through a long shift, even though the bar indicator still shows charge. What's causing that?

Sustained RF output over several hours creates continuous draw on the cell stack, and voltage sag under that load can pull the supply rail low enough that the PA stage reduces output power to stay within its operating window — even while the bar indicator still reads mid-range. This is a voltage sag issue, not a capacity issue. The fix is to allow the pack to rest off-load for a few minutes, which lets the cell voltage recover; or rotate to a second pack mid-shift to spread the load cycle.

The new pack sat unused in a drawer for several months and now the dock won't recognise it at all — no LEDs, nothing. Can it be recovered?

Extended storage at low temperatures or in a discharged state can push the cell voltage below the dock's minimum acceptance level, causing the dock to see the pack as absent rather than faulted. Connect the pack to a universal Li-ion charger set to recovery or boost mode, and bring the cell voltage up to at least 7.0V. Once the pack reaches that level, reseat it in the Motorola dock — the dock should then recognise it and continue charging normally to full voltage (8.4V at charge completion).

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