SKU: 31743712261

Motorola PMNN4818A IMPRES 2 Li-Ion 3650mAh TIA4950 Battery (IP68)

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Description

Motorola PMNN4818A IMPRES 2 Li-Ion 3650mAh TIA4950 Battery (IP68)Intrinsically Safe Cold Weather Power for APX N70 Series Deploy with confidence in hazardous locations using this TIA4950 certified 3650mAh IMPRES 2 battery. The Motorola PMNN4818A is a high performance IMPRES 2 Lithium Ion battery specifically engineered for the APX N70 and APX N70XE portable radios. This battery is TIA4950 certified as intrinsically safe, making it a critical requirement for users operating in environments where flammable gases,

Intrinsically Safe Cold-Weather Power for APX N70 Series

Deploy with confidence in hazardous locations using this TIA4950 certified 3650mAh IMPRES 2 battery.

The Motorola PMNN4818A is a high-performance IMPRES 2 Lithium-Ion battery specifically engineered for the APX N70 and APX N70XE portable radios. This battery is TIA4950 certified as intrinsically safe, making it a critical requirement for users operating in environments where flammable gases, vapors, or combustible dust may be present. With a substantial 3650mAh capacity, the PMNN4818A provides the extended duty cycles necessary for long shifts, ensuring your communication remains uninterrupted during mission-critical tasks in dangerous conditions. The Motorola PMNN4818A is the updated version of the Motorola PMNN4818.

Equipped with Motorola’s advanced IMPRES 2 technology, the PMNN4818A features a self-calibration capability that manages battery health automatically. When maintained with IMPRES 2 chargers, the battery eliminates the need for manual monthly reconditioning, saving hours of downtime and extending the overall life of the power cell. The rugged IP68-rated housing is submersible in up to 2 meters of water for 4 hours and is optimized for extreme cold-weather operations, supporting reliable radio performance in temperatures as low as -30°C.

Key Features & Benefits

  • TIA4950 Intrinsically Safe: Certified for use in hazardous environments where explosive gases or dust are a constant risk.
  • IMPRES 2 Smart Technology: Features automated self-calibration and maintenance to maximize life cycles and operational readiness.
  • Extreme Cold Operation: The Motorola PMNN4818A is engineered to maintain full power delivery in freezing conditions down to -30°C.
  • IP68 Submersible Rating: Ruggedized, dust-tight, and waterproof construction protects the battery during total submersion.
  • High-Density 3650mAh Cell: Balanced design provides a high-capacity power solution while maintaining a manageable profile for the APX N70 series.

Specifications

Attribute Details
Brand Motorola
Model/SKU PMNN4818A
Product Type IMPRES 2 Li-Ion Battery
Voltage 7.4V
Battery Chemistry Lithium-Ion (Li-Ion)
Capacity 3650 mAh
IP Rating IP68 (Submersible)
Intrinsic Safety TIA4950 Certified
Operating Temp -30°C to +60°C
Weight 0.57 lbs (260g)
Color Black

Compatibility

APX N70 APX N70XE

Recommended Accessories

  • Motorola IMPRES 2 Single-Unit Fast Charger (PMPN4604) — Required for automated self-calibration and optimal battery health.
  • Motorola Heavy-Duty Spring Belt Clip (PMLN7008) — Rugged 2.5-inch clip for secure radio mounting.
  • Motorola XVP730 Remote Speaker Microphone (PMMN4142A) — Mission-critical noise-canceling RSM compatible with APX N70 series.

More Resources

  • Manufacturer Data Sheet
  • Accessories Catalog
  • Battery Care Guide
  • Atlantic Radio Blog

Frequently Asked Questions

Is the Motorola PMNN4818A battery intrinsically safe?

Yes. This battery is TIA4950 certified for use in hazardous locations when used with a compatible intrinsically safe APX N70 or N70XE radio.

Do I need to recondition this battery every month?

No. When used with an IMPRES 2 charger, the self-calibration feature manages the battery’s health automatically, removing the need for manual reconditioning cycles.

Can I use this battery with an APX N50 radio?

No. The PMNN4818A is specifically designed for the APX N70 and N70XE series and is not compatible with the APX N30 or N50 series radios.

 

Warranty

2-year manufacturer's warranty.

Shipping Notes
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SKU: 31743712261

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Bil R.
Houston, US
★★★★★ 5
Perfect fit for 5.7 Mercruiser
Great fit for mercruiser 5.7 Have had it installed for about 6 months and still working great!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 17, 2026
A
Verified Purchase
Arelius Walker
West Palm Beach, US
★★★★★ 5
Great Buy!!! 5-Star!!!
Bolted up! Boat starts like the original starter! Great Buy!!!
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Reviewed in the United States on April 1, 2026
N
Verified Purchase
neil d.
Omaha, US
★★★★★ 4
Seems good but not a direct replacement
This starter did work but it was not a direct replacement for the starter in my 1986 Malibu skier with 5.7 mercruiser direct drive. This starter is a mini-starter, which is great in that it’s smaller and lighter but it meant that my starter bolts were too long and I had to add 3/8” stack of washers under the bolt heads. The bracket that supports the front of the starter to the engine block was also not able to be used because the new starter is shorter, although with the lighter starter, that bracket is probably no longer necessary. First few starts have been fine.
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Reviewed in the United States on July 10, 2025
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Verified Purchase
Jerry Sonnier
Alexandria, US
★★★★★ 5
Fit Great. Works great.
Fit perfectly Mercruiser 4.3
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Reviewed in the United States on March 22, 2026
A
Verified Purchase
Amazon Customer
Pawtucket, US
★★★★★ 5
Boat once again starts
Easy install once I figured out how to reach the starter. Worked first try and my boat is starting again. I think being a contortionist would help with the install since it is under the engine and boats typically only have access from the top. It probably took me an hour to get the old one off and about 30 min to install the new. The symptom of the broken one was a click sound when trying to start the motor, but nothing turning over. Same sound with new. Battery or a jumper.
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Reviewed in the United States on October 10, 2025

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