7.5V 3600mAH Ni-MH Battery Compatible with EF-Johnson 51LT ES - Long

In this review the focus is on a direct replacement battery for professional two-way radios: a 7.5V 3600mAH Ni-MH pack compatible with the EF-Johnson 51LT ES and many Motorola models. The bottom line is simple: this is for users who need a high-capacity, drop-in replacement that promises reliable runtime and parts compatibility. Our review finds the battery best suited to field technicians, security teams, and agencies that want extended service life without changing chargers or radio housings.

Key Features

• 7.5V 3600mAH Ni-MH: The higher capacity provides longer runtime between charges, reducing mid-shift battery swaps for intensive users.
• Premium Quality, Brand New: Built as a fresh replacement pack to match original equipment form factor and electrical requirements for easy installation.
• Wide Device Compatibility: Works with EF-Johnson 51LT ES series and a long list of Motorola XTS and MTP models, simplifying inventory for mixed fleets.
• 12 Month Warranty: A one-year warranty gives a reasonable safety net for early defects and assures buyers of manufacturing confidence.
• Replacement Part Numbers Included: Matches many OEM P/Ns such as NTN9183 and HNN8299, making it straightforward to confirm compatibility with service records.

Who It's For

This battery is aimed at professional users who operate legacy EF-Johnson and Motorola TETRA/XTS radios in demanding environments and need a drop-in, high-capacity replacement. Field technicians, event staff, and public safety support teams will appreciate the extended runtime and the long compatibility list that reduces the need to carry multiple battery types.

Users who require the absolute latest battery chemistry advances or formal certification from a device OEM should look elsewhere; this pack is a high-capacity Ni-MH replacement built for compatibility and reliable day-to-day use rather than cutting-edge cell chemistry or manufacturer-certified branding.

Pros & Cons

Pros

• High 3600mAH capacity delivers noticeably longer operating time than many standard packs.
• Fits a broad range of EF-Johnson and Motorola radio models, easing fleet management.
• Brand new construction and a 12 month warranty provide basic buyer protection.

Cons

• Ni-MH chemistry is reliable but heavier and less energy-dense than modern Li-ion alternatives.
• Not an OEM-branded cell, so organizations needing manufacturer-certified parts may prefer original batteries.

Specifications

Battery Type	Ni-MH
Voltage	7.5V
Capacity	3600mAH
Warranty	12 Months
Compatible Radios	EF-Johnson 51LT ES, 51SL, 5100ES and Motorola XTS/MTP series
Replacement P/Ns	NTN9183, HNN8299, NNTN443 and others

Our Verdict

This 7.5V 3600mAH Ni-MH replacement is a solid, cost-effective option for teams running EF-Johnson and many Motorola radios who prioritize runtime and compatibility. It represents good value for organizations that need dependable swaps and a one-year warranty, although buyers seeking the lightest or latest cell technology should consider alternate chemistries.

Frequently Asked Questions

Will this battery fit my EF-Johnson 51LT ES radio?
Yes, it is designed to be 100% compatible with EF-Johnson 51LT ES series radios and installs like the original pack.

Does it work with Motorola XTS and MTP models?
Yes, the listing specifies compatibility with multiple Motorola XTS and MTP models such as XTS 300 and MTP300, making it suitable for mixed fleets.

What warranty is provided?
The battery includes a 12 month warranty covering defects from the date of shipment.