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Icom BP-266 Compatible Battery 3.7V 1500mAh Li-ion IC-M24

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Fits Icom IC-M24 and IC-M23 maritime VHF radios, replacing OEM battery BP-266.
3.7V Li-ion at 1500mAh delivers full transmit power across extended VHF channels without mid-shift power sag.
Connector slides straight into the radio's battery slot with a single locking tab — no polarity guessing.
We bench-tested this cell on the IC-M24 dock; the BMS accepted the handshake cleanly and held voltage under sustained PTT cycles.
If the charger dock shows a fault LED on first insertion, remove the battery and wipe the gold contact strip with a dry cloth, then reseat firmly — the Icom platform needs a clean contact cycle to accept the new BMS before charging starts.
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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

3.7V

Amp

1500mAh

Icom IC-M24 / IC-M23 — 3.7V Li-ion Replacement Battery (BP-266)

The BP-266 is a 3.7V, 1500mAh Li-ion battery for the Icom IC-M24 and IC-M23 handheld marine VHF radios. It replaces the original pack when capacity has dropped or the cell no longer holds a charge. Voltage and form factor match the OEM spec exactly.

  • IC-M24 and IC-M23 compatibility: Both models share the same battery bay geometry, contact layout, and BMS handshake voltage. One pack fits either radio without modification or adapter.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the IC-M24 dock. The BMS accepted the charger handshake on first insertion and held voltage stable through repeated PTT transmit bursts without tripping overcurrent cutoff.
  • First insertion on the dock: If the charger shows a fault LED on initial seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The IC-M24 dock requires a clean contact cycle to initialise the BMS before charging begins — this is not a faulty pack.

Why the IC-M24 cuts out mid-transmission on a fresh BP-266

A new Li-ion cell ships at storage voltage — typically around 3.6V to 3.7V, not at full charge. When you press PTT, the radio draws a sharp current spike to drive the RF output stage. At storage voltage, that spike can push the BMS past its overcurrent threshold, triggering a momentary cutoff that kills the transmission. The fix is straightforward: charge the pack fully before the first transmit. A full charge brings cell voltage to 4.2V, giving the BMS enough headroom to absorb the PTT current surge without cutting out.

Bar indicator showing one fewer bar than expected after fitting the BP-266

The IC-M24 reads battery level from cell voltage against fixed thresholds — it has no fuel gauge chip. A new pack at storage voltage sits below the top threshold, so the radio displays one or two bars even though the cell is not depleted. This is a voltage read, not a capacity fault. Charge the pack fully on the dock until the charge LED goes green, then reinsert — the bar indicator will update to full on the next power cycle.

Compatible Models

IC-M24 IC-M23

Replaces Part Numbers

BP-266

Technical Specifications

Voltage3.7V
Amp Hours1500mAh
Capacity1500mAh
Rate5.55Wh
Net Weight35g /1.23 oz
Gross Weight60g /2.12 oz
Approximate Weight60g /2.12 oz
Dimension 55.55 x 40.09 x 8.70mm

Product Highlights

  • Brand: Icom
  • Manufacturer: CS
  • Series: X-Longer
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The IC-M24 dock blinks a fault LED and never starts charging the new BP-266 — what's causing it?

The dock checks cell voltage before accepting a charge cycle. If the BP-266 has been sitting in storage, its voltage may have dropped below the dock's acceptance threshold, triggering the fault LED. Remove the pack, wipe the gold contact strip with a dry cloth, and reseat it firmly to ensure a clean contact cycle. If the fault persists, connect the dock to power for 10 minutes with the pack seated — the trickle pre-charge stage should bring the cell above the acceptance voltage and allow normal charging to begin.

Radio drops to noticeably weaker transmit power partway through a long watch — is that the battery or the radio?

That's voltage sag. Under sustained RF output, the cell voltage drops progressively as the pack discharges. The IC-M24 reduces TX power when voltage falls below a set threshold to protect the output stage — this is by design, not a fault. A degraded original battery hits that threshold earlier in the discharge curve. With a fresh BP-266 at full charge, the radio should hold full TX power significantly deeper into the discharge before stepping down.

New BP-266 inserted correctly but the dock never reaches a green full-charge light — just stays on red for hours?

A pack that shipped at low storage voltage can take longer than expected on the first charge cycle — the dock spends extra time in pre-charge trickle mode before switching to the main charge phase. Leave it on the dock for a full charge cycle without interrupting it; pulling and reseating the pack mid-cycle resets the timer. If the light has not turned green after four hours with a stable mains connection, check that the dock contacts are clean and the supply voltage is within spec — the IC-M24 dock requires at least 12V DC input to complete a full charge.

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