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Four rectangular black battery packs with gold contacts and labels

Astro Gaming

Astro Gaming 2 in 1 accessory KNB-57L 2000mAh 7.4V 4-pack

SKU CH-R9C2-82B06

Four 2000 mAh 7.4 V lithium-ion packs replace Kenwood KNB-24, KNB-35L, KNB-55L, KNB-56N, KNB-57L, KNB-78L and KNB-79LC batteries for NX and TK series radios

  • Extended talk time from 2000mAh lithium-ion cells
  • Ready for Kenwood NX and TK series radios
  • Replaces seven original battery part numbers
  • Five protection circuits guard against faults
  • Four-pack keeps spare power on hand

Four-pack replacement batteries for Kenwood radios

This set contains four lithium-ion packs rated at 2000mAh and 7.4V, matching the original KNB-57L form factor. They are built for users of Kenwood NX and TK series walkie-talkies who need extended talk time during patrols, site work or outdoor trips. Each unit is a direct drop-in replacement requiring no modification.

Thermal behaviour and power draw

The cells operate at the standard 7.4V nominal voltage and store 14.80Wh of energy, delivering longer operating periods between charges. Built-in protection circuitry guards against overcharge, over-discharge, overcurrent, short circuit and high temperature events during normal use. No active cooling or external management is required.

Build quality and daily handling

Each battery measures 115.00 x 54.00 x 17.70 mm and fits the battery rails of compatible models including the NX-220, NX-320, TK-2140, TK-2160, TK-2168, TK-2170, TK-2360, TK-3140, TK-3160, TK-3170, TK-3173, TK-3360, NX-3200, NX-3300 and NX-3400. The pack replaces original part numbers KNB-24, KNB-24L, KNB-35L, KNB-55L, KNB-56N, KNB-57L, KNB-78L and KNB-79LC. Buyers whose radios use a different battery footprint or voltage will find these packs incompatible.

How it compares

Measured against everything we stock in 2-in-1 Device Accessories, at today’s prices. Recalculated every night.

Price $118.99
Pricier than about 78% of the 7,473 comparable items (median $56.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install the KNB-57L battery in my Kenwood NX-3200, and what step do people often miss?

Slide the pack into the radio's battery compartment until the latch clicks; the step users miss is fully seating the contacts so the 7.4V connection locks before tightening the belt clip.

What maintenance or replacement will the 2000mAh lithium-ion packs need later?

Store at roughly half charge if unused for weeks, keep contacts clean, and replace the four-pack when run-time falls well below the rated 14.80Wh capacity.

What limit appears first during a long patrol with the NX-3300 on high power?

The 2000mAh cells will hit their over-discharge protection before the radio's thermal limits, cutting output to preserve the 7.4V pack.

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