Kenwood NX-220 Replacement Battery KNB-24L 7.4V 2000mAh
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Kenwood NX-220 Replacement Battery KNB-24L 7.4V 2000mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Kenwood NX-220 Replacement Battery KNB-24L 7.4V 2000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
7.4V
Amp
2000mAh
Kenwood NX-220 / NX-320 Series — 7.4V Li-ion Replacement Battery (KNB-57L)
This 7.4V, 2000mAh Li-ion battery replaces the KNB-24L, KNB-35L, KNB-55L, KNB-56N, KNB-57L, KNB-78L, and KNB-79LC OEM packs. It fits the Kenwood NX-220, NX-320, NX-3220, NX-3320, and over 20 additional NX-series and NEXEDGE radios. Same voltage rail, same connector footprint, same BMS handshake protocol as the factory pack.
- NX-220 / NX-320 / NX-3220 / NX-3320 platform fit: These four radios share the same battery bay dimensions, 7.4V power rail, and BMS communication pins. One pack covers all four because the dock charge circuit and transmit draw spec are identical across the group.
- Bench tested on actual hardware: We ran this pack through PTT transmit cycles on the NX-320 platform. The BMS handled the transmit current spike without tripping overcurrent cutoff, and the dock accepted the BMS handshake on the first insertion cycle.
- 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 NEXEDGE dock requires a clean contact cycle to register the new BMS before it begins charging — this is not a faulty pack.
Why the NX-220 cuts out mid-transmission on a freshly inserted pack
The NX-220 transmit circuit draws a sharp current spike the moment PTT is pressed. If the battery BMS has not completed its handshake with the radio's protection circuit, that spike can trip the BMS overcurrent threshold and cut the transmission instantly. This is more likely with a new pack sitting at storage voltage — roughly 3.7V per cell — rather than a fully charged one. Charge the pack to full in the dock before the first shift and the BMS trip threshold resets to its normal operating window.
Bar indicator showing one fewer bar than expected after a full dock charge
The NX-series bar indicator reads voltage thresholds, not a fuel gauge chip. A new cell shipped at storage voltage can show one bar below full even after the dock light goes green, because the first charge cycle does not always bring the cell to peak resting voltage. Run one full discharge-to-cutoff followed by a complete dock charge. After that cycle, the resting voltage stabilises above 8.2V and the bar indicator reads correctly.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 NX-320 cuts out the moment I press PTT — is the new battery tripping the BMS?
Yes. PTT generates a transmit current spike that can exceed the BMS overcurrent threshold on a pack still sitting at storage voltage. Charge the battery fully in the dock before the first use — storage voltage is roughly 3.7V per cell, well below the 4.1–4.2V the BMS needs to widen its overcurrent window. After a complete charge cycle, the cutout stops.
The dock light stays on fault and never shifts to charging — the pack is inserted correctly but nothing happens.
The Kenwood dock runs a BMS handshake check on insertion. If the contact strip on the battery or the dock pins have any film or oxidation, the handshake fails and the dock holds the fault LED rather than starting the charge cycle. Remove the pack, wipe the gold contacts on both the battery and the dock with a dry cloth, and reseat firmly. One clean contact cycle is usually enough for the dock to accept the pack and begin charging.
The radio drops to noticeably weaker audio output mid-shift — the battery bar still shows two bars, so what's happening?
Sustained RF output draws more current than standby or receive mode. If cell impedance is higher than the radio expects — common early in a new pack's life before it has been fully cycled — voltage sags under load even when resting voltage looks fine. The NX-series interprets that sag as reduced headroom and steps down TX power to protect the circuit. Run two full charge and discharge cycles to condition the cells, and the impedance drops to its rated level.
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