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Kenwood P25 Replacement Battery 7.4V 5000mAh KNB-L1

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New arrival
From $57.99 USD $71.99
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Fits Kenwood P25, TK-5230, TK-5330, TK-5430 and replaces KNB-L1, KNB-L2, KNB-L3, KNB-N4, KNB-L2M, KNB-L3M, KNB-LS5, KNB-LS6, KNB-N4M battery packs.
7.4V lithium-ion delivers 5000mAh capacity for full-shift operation on P25 portable radios without mid-cycle swap.
Connector seats flush into radio dock with positive terminal centered; locking tab engages on left side only.
We bench-tested against factory dock voltage acceptance threshold — BMS held 7.2V after first contact cycle.
If the charger dock shows fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly.
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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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

5000mAh

Kenwood P25 / TK-5230 / TK-5330 / TK-5430 — 7.4V Li-ion Replacement Battery (KNB-L1)

This 7.4V, 5000mAh (37Wh) lithium-ion battery replaces the KNB-L1, KNB-L2, KNB-L3, KNB-N4, and related OEM packs. It fits the Kenwood P25 series and TK-5230, TK-5330, and TK-5430 portable radios. These are land mobile radios used in professional and commercial environments where losing comms mid-shift is not an option.

  • TK-5000 and P25 platform fit: The TK-5230, TK-5330, and TK-5430 share the same battery bay geometry, contact pin layout, and 7.4V power rail. The BMS in this pack is matched to that voltage range, so the radio firmware accepts the handshake without throwing a fault code.
  • Bench tested on actual hardware: We ran this pack through a full charge cycle on a Kenwood multi-unit charger dock and monitored BMS communication. The protection circuit tripped correctly at the low-voltage threshold and the dock advanced to the ready state without fault LEDs.
  • First-insertion contact check: If the charger dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The Kenwood platform requires a clean contact cycle to complete the BMS handshake before charging begins — this is not a defect.

Why the TK-5430 cuts out mid-transmission on a new KNB-L1 replacement

P25 radios draw a sharp current spike the moment PTT is pressed — RF output on the TK-5430 can pull over 2A in the first milliseconds of transmission. If the replacement pack arrived at storage voltage (typically around 3.7V per cell, or ~7.4V total), the BMS may interpret that transmit surge as an overcurrent event and cut power briefly. This is not a faulty battery — it is the protection circuit doing its job on an undercharged cell. Charge the pack fully before the first transmit test; at full charge the cells handle the PTT spike without tripping.

Bar indicator showing one fewer bar than expected after fitting this pack

Kenwood P25 radios use simple voltage-threshold bar indicators — each bar maps to a voltage band, not a fuel gauge percentage. A new pack shipped at storage voltage will sit in a lower voltage band and display one fewer bar than a fully charged pack. This is normal cell behaviour, not a capacity problem. Put the battery through one full charge cycle on the Kenwood dock and the indicator will reflect the correct charge state. Expect the first bar to appear around 7.2V and the full display at or above 8.0V.

Compatible Models

P25 TK-5230 TK-5330 TK-5430 NX-5000 NX-5200 NX-5300 NX-5400 VP5000 VP5230 VP5330 VP5430 VP6000 VP6230 VP6330 VP6430 VP8000

Replaces Part Numbers

KNB-L1 KNB-L2 KNB-L3 KNB-N4 KNB-L2M KNB-L3M KNB-LS5 KNB-LS6 KNB-N4M

Technical Specifications

Voltage7.4V
Amp Hours5000mAh
Capacity5000mAh
Rate37Wh
Net Weight189g /6.67 oz
Gross Weight369g /13.02 oz
Approximate Weight369g /13.02 oz
Dimension 116.50 x 58.10 x 31.60mm

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-5330 drops to low-power TX mode partway through a long transmission — is this the battery?

Yes, this is voltage sag under sustained RF output. During extended transmissions the cell voltage dips; when it crosses the radio's low-voltage threshold, the TK-5330 steps down transmit power to protect the pack. On a worn original battery this happens quickly because internal cell impedance has risen. With a new 5000mAh pack at full charge, the voltage holds more steadily under load and the radio stays in full-power TX. Charge the new pack completely before your first extended transmission test.

The charger dock fault LED came on the moment I inserted the new KNB-L1 — it never cleared, even overnight. What's wrong?

A pack below the dock's acceptance voltage threshold will trigger a fault LED that does not self-clear, because the dock refuses to begin the charge cycle when cell voltage is too low. New packs sometimes arrive below that threshold after storage and transit. Remove the battery, wipe the gold contact strip and the dock contacts with a dry cloth, reseat the pack firmly, and check that the contacts are fully engaged. If the LED still does not clear, the pack needs a boost charge — some Kenwood multi-unit chargers have a recovery slot; use it, or contact the dock to a second charger if one is available.

After the radio sat unused for three months with the old battery in it, the new KNB-L1 I just fitted shows only one bar and the radio won't transmit. Is the new battery dead on arrival?

The new battery is almost certainly fine — the issue is that a pack shipped at storage voltage reads in the lowest voltage band on a Kenwood bar indicator, and some P25 models will not initiate a transmission when the displayed charge level is below a set threshold. Remove the battery from the radio and place it directly in the charger dock for a full charge cycle before re-inserting. Once the pack reaches above 7.8V the radio will register a usable charge level and transmit normally.

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