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Kenwood KNB-45 TK-3200L Compatible Battery 7.4V 1800mAh

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Fits Kenwood TK-3200L-U15P and 50+ portable radio models; replaces OEM KNB-45, KNB-45L, KNB-45Li battery packs.
Delivers 7.4V at 1800mAh—standard output for sustained RF transmission without voltage sag during extended shifts.
Connector slides straight down into radio slot with mechanical locking tab; orientation is fixed, no forced insertion needed.
We bench-tested this cell in a TK-3200L-U15P under sustained PTT load; BMS accepted the pack on first dock insertion and held 7.4V steady under RF draw.
On first use with this Kenwood radio, wipe the gold contact strip on both the battery and radio dock with a dry cloth, then reseat firmly—the Kenwood platform requires clean contact engagement before the charger will signal full acceptance.
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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

1800mAh

Kenwood TK-3200L-U15P Series — 7.4V Li-ion Replacement Battery (KNB-45)

This is a 7.4V, 1800mAh Li-ion replacement battery for the Kenwood TK-3200 and TK-3202 series portable two-way radios. It replaces OEM part numbers KNB-45, KNB-45L, and KNB-45Li across a wide range of UHF handhelds in this family. The cell and BMS are matched to the voltage thresholds the radio's power management circuit expects.

  • TK-3200 and TK-3202 platform fit: Both series share the same battery bay geometry, contact layout, and 7.4V nominal rail. The BMS in this pack communicates the same charge-acceptance signal the dock needs — no pin adapter or firmware change required.
  • Bench tested on actual hardware: We cycled this pack through repeated PTT-triggered transmit loads to confirm the BMS handles the current spike without tripping overcurrent protection. Voltage held stable across the transmit window.
  • First-insertion contact check: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The Kenwood dock requires a clean contact cycle to complete the BMS handshake before charging begins.

Why the TK-3200 cuts out mid-transmission on a new KNB-45

A new Li-ion pack ships at storage voltage — typically around 3.7V per cell, not the full 4.2V. When the radio keys up, transmit current spikes sharply. If the cell hasn't been fully charged first, that spike can pull the pack voltage below the BMS cutoff threshold, causing the radio to drop out mid-transmission. This is not a faulty battery — it's the BMS doing its job on a partially charged cell. Charge the pack fully before first use in a shift environment. After a full charge cycle, the cutout behaviour stops.

Bar indicator showing one fewer bar than expected after inserting a new KNB-45

The TK-3200 uses voltage-threshold logic to drive the bar display — it reads resting pack voltage and maps it to a bar count. A new pack at storage voltage will read lower than a freshly charged one, so the radio shows one or two bars even though the cell is fine. This is not a capacity defect. Put the pack through a full charge cycle in the Kenwood dock until the charge LED goes green, then reinsert. The bar count will reflect actual charge state — typically full bars at 8.2V or above.

Compatible Models

TK-3200L-U15P TK-3202L-U16P TK-3200-U2P TK-3200-U8P TK-2200L TK-3200L TK-2200LP TK-3200LP TK-2300VP TK-3300UP TK-2302VK TK-3302UK TK-2206 TK-3206 TK-2207 TK-3207 TK-2200 TK-2200P TK-2202 TK-2202E TK-2206M TK-2207G TK-2212L TK-2212M TK-2302E TK-2302T TK-2306M TK-2307M TK-3200 TK-3200P TK-3202 TK-3202E TK-3202E3 TK-3206M TK-3206M3 TK-3207G TK-3212L TK-3212M TK-3301E TK-3301T TK-3302E TK-3302E3 TK-3302T TK-3306M3 TK-3307M2 NX240 NX340 NX248 NX348 TK-3707 NX-1300 NX-1302AU NX-240M TK-D340 TK-D340E

Replaces Part Numbers

KNB-45 KNB-45L KNB-45Li

Technical Specifications

Voltage7.4V
Amp Hours1800mAh
Capacity1800mAh
Rate13.32Wh
Net Weight100g /3.53 oz
Gross Weight135g /4.76 oz
Approximate Weight135g /4.76 oz
Dimension 115.00 x 54.00 x 17.70mm

Product Highlights

  • Brand: Kenwood
  • 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

My TK-3200 drops to low TX power partway through a long shift — is that the battery or the radio?

That's voltage sag under sustained RF output, not a radio fault. As the cell discharges toward its lower threshold, available current drops, and the radio's power management circuit steps down transmit power to stay within operating limits. It's more pronounced if the pack hasn't been fully charged before the shift. Start each shift with a full charge and the drop-off point moves significantly later in the day.

The Kenwood charger dock flashes a fault LED and never clears after I insert the new KNB-45 — what's happening?

The dock rejected the pack because the cell voltage came in below the dock's acceptance threshold — common on a pack that's been in storage. The dock won't begin charging if it reads the pack as too far discharged. Remove the battery, let it sit at room temperature for ten minutes, then reseat it firmly with clean contacts. If the fault clears and charging begins, let the full cycle complete before using the radio.

The TK-3200 cuts out the moment I press PTT, but works fine on the original battery — what's causing that?

PTT triggers a sharp current spike as the transmitter powers up. A new pack at storage voltage may sit just above the BMS overcurrent cutoff threshold — the spike pushes it over, and the BMS opens the circuit to protect the cell. The radio powers back on because resting voltage recovers quickly. Charge the pack fully to 8.4V before first use. After a complete charge cycle, the resting voltage is high enough that the transmit spike no longer trips the cutoff.

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