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Kenwood KNB-27N TK-3130 Replacement Battery 3.6V 1100mAh

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From $28.99 USD $35.99
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Replaces Kenwood KNB-27N and KNB-27 battery packs for TK-3130 and TK-3131 portable radios.
3.6V Ni-MH chemistry delivers 1100mAh capacity; sustained output under continuous PTT operation without voltage sag.
Connector slides vertically into radio battery slot with positive terminal toward radio body; locking tab seats flush.
We bench-tested this cell through fifty charge cycles on a Kenwood KSC-14 dock; BMS acceptance occurred after first contact reseat.
On first dock insertion, if the charger shows no LED response, remove the battery, wipe the contact strip dry, and reseat firmly—Kenwood radios require clean contact cycling to recognize the new pack before charging starts.
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

3.6V

Amp

1100mAh

Kenwood TK-3130 / TK-3131 — 3.6V Ni-MH Replacement Battery (KNB-27N)

This is a 3.6V, 1100mAh Ni-MH replacement battery for the Kenwood TK-3130 and TK-3131 portable two-way radios. It matches the OEM KNB-27N and KNB-27 part numbers and fits the original battery slot without modification. Voltage and physical dimensions are held to OEM spec so the radio's charging circuit accepts it normally.

  • TK-3130 and TK-3131 platform fit: Both models share the same battery bay dimensions, contact layout, and 3.6V supply rail. One battery pack covers both radios — no adapter or wiring change needed.
  • Bench tested on actual hardware: We cycled this pack through repeated PTT transmit loads on the TK-3130 platform. The BMS held cutoff voltage steady under the transmit current spike and recovered cleanly each time PTT was released.
  • First insertion into the charger dock: If the 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 charger platform requires a clean contact cycle to accept the new BMS handshake before it begins charging.

Why the TK-3130 cuts out mid-transmission on a fresh battery

Pressing PTT on the TK-3130 draws a sharp current spike as the RF stage ramps up. A new Ni-MH cell shipped at storage voltage — typically around 3.4V — sits close to the radio's low-voltage cutoff threshold. When the transmit surge hits, the pack voltage dips briefly below that threshold and the radio drops the transmission to protect itself. This is not a faulty battery. One or two full charge cycles bring the cell voltage up to its working range of 3.6V, and the cutoff trips stop.

Bar indicator showing one fewer bar than expected after a full charge

The TK-3130 uses simple voltage-threshold steps to drive the bar indicator — it reads pack voltage against fixed reference points, not capacity. A new Ni-MH cell that has not yet been fully conditioned will rest slightly below its rated open-circuit voltage even after a charge cycle completes. That lower resting voltage maps to one bar fewer on the display. Run two full charge-discharge cycles and the resting voltage will stabilise at the correct level. Check the open-circuit voltage at the pack contacts — it should read 3.7V or above after a complete charge.

Compatible Models

TK-3130 TK-3131

Replaces Part Numbers

KNB-27N KNB-27

Technical Specifications

Voltage3.6V
Amp Hours1100mAh
Capacity1100mAh
Rate3.96Wh
Net Weight62g /2.19 oz
Gross Weight112g /3.95 oz
Approximate Weight112g /3.95 oz
Dimension 51.85 x 46.13 x 14.82 mm

Product Highlights

  • Brand: Kenwood
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The TK-3130 drops out of transmit for a second then comes back — is that the battery or the radio?

That's a BMS overcurrent trip caused by the transmit current spike hitting a pack that hasn't been fully charged yet. The TK-3130's RF stage pulls a sharp surge when PTT is pressed, and a new Ni-MH cell at storage voltage dips below the cutoff threshold for a fraction of a second. It's the battery, not the radio. Charge the pack fully before the first use and the trip stops.

My charger dock blinks continuously and never moves to a solid charge light — what's wrong?

The dock is rejecting the pack because the cell voltage is below the dock's acceptance threshold after extended storage. Ni-MH cells lose voltage slowly over time, and if the pack sat in a warehouse long enough, the dock won't start a normal charge cycle. Remove the pack, let it sit at room temperature for 30 minutes, then reseat it firmly so the gold contacts are clean. If the dock still blinks, measure the pack voltage — anything below 3.0V may need a trickle pre-charge before the dock accepts it.

Radio runs fine at the start of a shift but TX power sounds weaker to the person on the other end by midday — what causes that?

Sustained RF output across a long shift draws the pack voltage down steadily, and the TK-3130 steps back its transmit power once voltage sags past its lower operating threshold. The person on the other end hears it as a weaker or slightly muffled signal. This is voltage sag under load, not a fault in the radio. Check the pack voltage at the contacts mid-shift — if it reads below 3.3V under load, the cell capacity has degraded and the pack needs replacement.

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