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Kenwood PB-36 7.2V 1000mAh Compatible Battery TK-235A

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From $33.99 USD $41.99
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Fits Kenwood TK-235A, TK-235, TH-235, and TH-235A portables; replaces OEM PB-36 and PB-37 battery packs.
7.2V, 1000mAh Ni-MH chemistry delivers steady voltage under sustained PTT transmission cycles on this radio.
Slides into the radio battery slot with a single locking tab; connector orientation is keyed, preventing backward insertion.
We bench-tested this pack on a TK-235A transmission cycle; BMS accepted the charger dock on first insertion, no fault LED.
If the charger dock shows a fault light after inserting this battery, remove it, wipe the gold contact strip dry, and reseat firmly — Kenwood's dock requires a clean contact cycle to handshake with the new pack before charging begins.
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.

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⚠️ 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

7.2V

Amp

1000mAh

Kenwood TK-235A / TH-235 Series — 7.2V Ni-MH Replacement Battery (PB-36, PB-37)

This is a 7.2V, 1000mAh Ni-MH battery replacing the OEM PB-36 and PB-37 packs. It fits the Kenwood TK-235, TK-235A, TH-235, and TH-235A portable transceivers. Same voltage rail, same form factor, same dock connector footprint as the original.

  • TK-235 and TH-235 platform compatibility: Both the TK and TH variants in this family share the same 7.2V Ni-MH battery bay and BMS handshake protocol. The PB-36 and PB-37 are electrically identical — only the outer casing differs slightly. This pack satisfies both.
  • Bench tested on actual hardware: We cycled this pack through full charge and discharge on a TK-235A dock. The BMS held within spec across PTT transmit bursts, and the charger dock accepted the pack cleanly after the first contact cycle.
  • First-insertion contact cycle: 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-235A cuts out mid-transmission on a new Ni-MH pack

A new Ni-MH cell ships at storage voltage — typically 1.1–1.2V per cell, which puts a 6-cell pack around 6.6–7.2V before its first full charge. During PTT, the transmit current spike can pull voltage below the radio's BMS cutoff threshold, tripping an overcurrent shutoff. This is not a faulty battery. Run one full charge cycle through the dock before using the radio on a shift. After the first charge, resting voltage should read 7.2V or above and mid-transmission cutouts will stop.

Bar indicator showing one fewer bar than expected on a freshly charged pack

The TK-235A uses a simple voltage-threshold bar indicator — it reads pack voltage and maps it to a bar count. A new Ni-MH pack that hasn't been fully conditioned will sit slightly below its rated peak voltage even after one charge, causing the indicator to show one bar short. This is a voltage reading, not a capacity fault. Put the pack through two full charge-discharge cycles and the resting voltage will settle at the top threshold, restoring the full bar display. Check the radio's battery indicator after the second cycle with the radio idle.

Compatible Models

TK-235A TK-235 TH-235 TH-235A

Replaces Part Numbers

PB-36 PB-37

Technical Specifications

Voltage7.2V
Amp Hours1000mAh
Capacity1000mAh
Rate7.2Wh
Net Weight142g /5.01 oz
Gross Weight212g /7.48 oz
Approximate Weight212g /7.48 oz
Dimension 70.10 x 58.50 x 31.00 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 charger dock LED never clears to green after inserting this new pack — it just keeps blinking. What's causing that?

A blinking fault LED on the Kenwood dock almost always means the pack voltage is below the dock's acceptance threshold. New Ni-MH cells arrive at storage voltage, and if the pack has been sitting in a warehouse, it may have self-discharged further. Remove the pack, let it sit at room temperature for 30 minutes, wipe the gold contacts on both the pack and dock with a dry cloth, then reinsert. If the dock accepts it, the charge cycle will begin normally — the pack needs to be above approximately 6.0V before the dock will start a charge.

The radio drops to noticeably weaker transmit power halfway through a long shift — new battery, not the old one.

This is voltage sag under sustained RF output. Ni-MH cells have higher internal impedance than Li-ion, and repeated PTT bursts over a long shift pull the pack voltage down faster under load than the idle voltage suggests. The radio's TX power management reads that sag and steps down output to protect the final stage. The fix is to avoid leaving the radio in high-power TX mode for extended back-to-back transmissions. If your operation requires sustained TX, check the radio's power setting — switching from high to medium TX power reduces the draw enough to keep pack voltage above the sag threshold for the full shift.

This pack sat unused for about four months and now the dock won't recognise it at all — is the battery dead?

Ni-MH cells self-discharge at roughly 1–2% per day, so four months of storage can push a pack well below the dock's minimum acceptance voltage. The BMS may have locked out to prevent damage. To recover it, connect the pack directly to a Ni-MH compatible smart charger — not the radio dock — set to a slow or recovery charge rate (around 0.1C, which is 100mA for this 1000mAh pack). Hold that charge for 2–3 hours. Once the cell voltage climbs above 6.0V per pack, the dock should recognise and accept it for a normal charge cycle.

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