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Icom BP-296 Marine Radio Replacement Battery 3.7V 2000mAh

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New arrival
From $35.99 USD $44.99
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Fits the Icom IC-M37 and IC-M37E marine VHF radio, replacing OEM part BP-296.
Delivers 3.7V at 2000mAh capacity; restores full transmit power and receive clarity on extended patrols.
Connector seats into the radio's vertical battery slot with spring-loaded locking tab on the left side.
We bench-tested the pack on an IC-M37 charger dock; BMS accepted voltage handshake on first insertion without fault indication.
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 Icom platform requires a clean contact cycle to accept the new BMS before charging begins.
Extended delivery time

Available by SPECIAL ORDER. Delivery for this product typically takes 2 weeks.

Extra Discount: As a thank you for your patience, enjoy an extra 5% off your order
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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

3.7V

Amp

2000mAh

Icom IC-M37 / IC-M37E — 3.7V Li-ion Replacement Battery (BP-296)

This is a 3.7V, 2000mAh Li-ion replacement for the Icom BP-296 battery pack. It fits the IC-M37 and IC-M37E handheld VHF marine transceivers. The pack slots into the same battery compartment as the original and uses the same contact layout.

  • IC-M37 and IC-M37E compatibility: Both the IC-M37 and IC-M37E share the same battery bay, contact strip, and BMS handshake protocol. The BP-296 form factor is identical across both variants, so no adapters or modifications are needed when swapping between units.
  • Bench tested on actual hardware: We ran this pack through full charge cycles on the IC-M37 dock and monitored the BMS response across transmit and standby draws. The BMS handled the PTT current spike cleanly without triggering overcurrent cutoff at standard marine VHF TX output.
  • First insertion into the charging dock: If the dock shows a fault LED on first insertion, pull the battery and wipe the gold contact strip with a dry cloth before reseating. The IC-M37 charger requires a clean contact cycle to complete the initial BMS handshake — this is not a faulty pack.

Why the IC-M37 cuts out mid-transmission on a new BP-296

A new Li-ion cell ships at storage voltage — typically around 3.6V — not at full charge. When the IC-M37 draws transmit current from a cell at storage voltage, the internal voltage can dip below the BMS cutoff threshold under load. The radio cuts out not because the pack is faulty, but because the BMS is protecting a cell that hasn't yet been fully charged. Run a full charge cycle before first use and the cutout behaviour stops.

Bar indicator showing one fewer bar than expected after fitting the BP-296

The IC-M37 reads battery level using voltage thresholds, not a fuel gauge chip. A new pack at storage voltage reads lower than a freshly charged cell, so the indicator can display one bar short even on a pack that has never been used. This is a voltage reading, not a capacity problem. Charge the pack fully to 4.2V and the bar display will reflect actual charge state.

Compatible Models

IC-M37 IC-M37E

Replaces Part Numbers

BP-296

Technical Specifications

Voltage3.7V
Amp Hours2000mAh
Capacity2000mAh
Rate7.4Wh
Net Weight45g /1.59 oz
Gross Weight70g /2.47 oz
Approximate Weight70g /2.47 oz
Dimension 57.60 x 36.20 x 12.60mm

Product Highlights

  • Brand: Icom
  • 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

The IC-M37 dock shows a blinking fault LED after I inserted the new BP-296 — is the battery dead?

The dock fault LED usually means the pack voltage is below the charger's acceptance threshold, which is normal for a cell shipped at storage voltage. Pull the battery, wipe the gold contact strip with a dry cloth, and reseat it firmly — the IC-M37 charger needs a clean contact cycle to complete the BMS handshake before it will begin charging. If the LED clears and charging starts, the pack is fine. If it persists after reseating, check that the contacts on the dock tray are not corroded or bent.

The radio cuts out the moment I press PTT, even though the bar indicator shows charge — what's happening?

This is a BMS overcurrent response to the transmit current spike on a cell that hasn't reached full charge voltage. The IC-M37 draws a short burst of current when PTT is pressed, and a cell sitting at storage voltage can sag below the BMS cutoff threshold under that load. The cutout is the protection circuit doing its job, not a faulty pack. Charge the BP-296 fully before use and the PTT cutout will not reoccur.

After sitting unused on the boat for two months, the IC-M37 won't power on even after a night on the charger — is the pack recoverable?

Extended storage can push a Li-ion cell below the BMS re-initialisation threshold, which causes the charger to see the pack as unresponsive. Remove the battery and leave it out of the radio for five minutes, then reseat it in the dock — this resets the BMS and allows the charger to attempt a recovery charge from a low-current trickle. If the dock accepts the pack and the charge LED activates, the cell is recovering. A cell that drops below 2.5V and stays there after a recovery attempt is permanently discharged and needs replacement.

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