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Motorola PMNN4490 XPR3300 Replacement Battery 7.4V 3400mAh

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New arrival
From $112.99 USD $139.99
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Fits Motorola XPR3300, XPR3300e, XPR3550, and XPR3550e radios; replaces PMNN4490, PMNN4490A, PMNN4490B, PMNN4490C, PMNN4418, PMNN4418BR, PMNN4418AR.
7.4V and 3400mAh capacity maintains full transmit power across extended shifts without voltage sag cutoff.
Motorola connector slides vertically into radio slot with gold contact strip facing outward; locking tab seats flush.
We bench tested this cell in an XPR3300 radio—BMS accepted charge dock handshake on first insertion, no fault LED.
If your charger dock shows a fault light after inserting this battery, remove it, wipe the gold contact strip with a dry cloth, and reseat firmly—the Motorola platform needs a clean contact cycle 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
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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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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.

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🔹 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.

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⚠️ 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

3400mAh

Motorola XPR3300 / XPR3550 Series — 7.4V Li-ion Replacement Battery (PMNN4490)

This 7.4V 3400mAh Li-ion battery replaces the PMNN4490 pack in Motorola's XPR3300, XPR3300e, XPR3550, and XPR3550e digital two-way radios. It uses the same cell configuration and BMS handshake profile as the factory pack. Swap it in when the original no longer holds a charge across a full shift.

  • XPR3300 / XPR3550 platform fit: Both the standard and 'e' variants share the same 7.4V battery rail, connector pinout, and BMS communication protocol — that's why a single pack covers all four models. The 'e' suffix indicates enhanced display, not a different battery compartment.
  • Bench tested on actual hardware: We ran this pack on an XPR3300e dock and monitored BMS handshake, charge acceptance, and PTT transmit current draw. The protection circuit held stable across repeated high-current transmit bursts without tripping into cutoff.
  • First insertion on a Motorola dock: If the dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The XPR platform requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the XPR3300 cuts out mid-transmission on a new battery

The XPR3300's BMS has an overcurrent threshold that trips when the PTT transmit spike exceeds what the pack expects at its current state of charge. A new cell shipped at storage voltage — typically around 3.7–3.8V per cell — has higher internal impedance than a fully charged cell. That impedance causes a sharper voltage sag under transmit load, which the BMS reads as a fault and cuts the output. Charge the pack fully to 8.4V before the first use and the transmit spike will stay within the BMS window.

Bar indicator showing one fewer bar than expected on a new PMNN4490

The XPR series uses voltage-threshold bar indicators, not a fuel gauge chip — so the display reflects real-time terminal voltage only. A new pack at storage voltage reads lower than a freshly charged pack, and the radio correctly shows one or two bars rather than full. This is not a fault with the cell. Run a full charge cycle until the dock LED goes solid green, then reinsert the pack — the bar display will update immediately to reflect the higher resting voltage above 8.0V.

Compatible Models

XPR3300 XPR3300e XPR3550 XPR3550e XiR P6600i XiR P6620i DEP550e DEP570 DP2400 DP2600

Replaces Part Numbers

PMNN4490 PMNN4490A PMNN4490B PMNN4490C PMNN4418 PMNN4418BR PMNN4418AR

Technical Specifications

Voltage7.4V
Amp Hours3400mAh
Capacity3400mAh
Rate25.16Wh
Net Weight220g /7.76 oz
Gross Weight400g /14.11 oz
Approximate Weight400g /14.11 oz
Dimension 119.10 x 55.10 x 41.00mm

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 XPR3300 drops to reduced TX power mid-shift — is the new battery causing it?

Yes, this points to voltage sag under sustained RF output, not a faulty cell. As the pack discharges toward the lower end of its charge window, terminal voltage under transmit load dips enough that the radio's power control circuit steps down output to protect the final stage. It is not a BMS cutoff — the radio stays on but transmits at reduced power. Keep a second charged pack on hand for shifts longer than one charge cycle, or top up the battery before voltage drops below 7.6V at rest.

The charger dock blinks a fault LED and never starts charging the new PMNN4490 — what's wrong?

The Motorola dock checks the pack's resting voltage before it opens the charge circuit. A cell shipped at storage voltage can sit just below the dock's acceptance threshold, triggering the fault blink instead of initiating a charge cycle. Remove the pack, wipe the gold contact strip with a dry cloth, and reseat it firmly to ensure a clean BMS handshake. If the fault persists, try a different dock — some units have a stricter low-voltage cutoff that requires a manual reset by holding the pack out for 30 seconds before reinsertion.

The XPR3550e powers on fine but the pack feels warm after a short time in the charger — is that normal?

Some warmth during the bulk charge phase is normal for a Li-ion cell at 3400mAh — the charge current is proportional to capacity and generates heat. The pack should be warm to the touch, not hot. If it becomes too hot to hold comfortably, remove it immediately and check that the dock contacts are clean, since a high-resistance contact causes the charger to draw excess current trying to maintain its charge voltage. Clean the contacts and confirm the dock output is within spec — 8.4V at termination.

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