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Icom BP-245 IC-M71 Compatible Battery 7.4V 2100mAh

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Fits Icom IC-M71, IC-M72, IC-M73 marine transceivers; replaces BP-245, BP-245N, BP-245H.
7.4V at 2100mAh delivers sustained transmission power on extended maritime patrols without mid-shift voltage sag.
Slide-lock connector seats flush into the IC-M71 battery bay; gold contact strip faces the radio body.
We bench-tested this cell in a stock IC-M71 charger dock—BMS accepted handshake on first insertion, full charge cycle completed without fault LED.
On first use, if the charger dock shows a fault light after inserting this cell, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly.
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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.

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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

7.4V

Amp

2100mAh

Icom IC-M71 / IC-M72 / IC-M73 Series — 7.4V Li-ion Replacement Battery (BP-245)

This 7.4V 2100mAh Li-ion battery replaces the BP-245, BP-245N, and BP-245H packs used in the Icom IC-M71, IC-M72, IC-M73, and IC-M73 Euro portable marine transceivers. It slots into the same battery compartment and uses the same contact layout as the original Icom pack. Voltage and capacity match the OEM spec exactly — 7.4V, 2100mAh (15.54Wh).

  • IC-M71 / IC-M72 / IC-M73 platform fit: These four models share the same battery bay dimensions, contact strip geometry, and BMS handshake protocol. One battery covers the full range because Icom standardised the BP-245 form factor across this marine VHF line.
  • Bench tested on actual hardware: We cycled this pack through transmit loads on the IC-M71 and confirmed the BMS held voltage above the radio's low-battery cutoff threshold under sustained PTT draws. No overcurrent trips occurred during the full test sequence.
  • Marine dock contact care: Salt air and moisture on the gold contact strip will cause a fault LED on first dock insertion. Before seating the pack in the charger, wipe the contact strip with a dry cloth — the Icom dock requires a clean contact surface to complete the BMS handshake and begin the charge cycle.

Why the IC-M71 cuts out mid-transmission on a fresh BP-245

A new Li-ion cell ships at storage voltage — typically around 3.7V per cell, giving roughly 7.4V at the pack terminals. On the IC-M71, that voltage is right at the edge of the radio's transmit threshold. When PTT is pressed, the transmit current spike causes a brief voltage sag that the BMS reads as an undercurrent event. The radio drops out because the BMS has tripped, not because the cell is faulty. Run one full charge cycle before the first transmission test — the pack needs to reach its operating voltage range of 8.2–8.4V to sustain transmit current without tripping.

Bar indicator showing one fewer bar than expected on a new BP-245

The IC-M71 reads battery level by measuring pack voltage against fixed thresholds — it does not track charge capacity. A new pack at storage voltage sits below the top threshold, so the radio displays one bar short of full even when the pack is not depleted. This is a voltage-threshold display behaviour, not a defective cell. Charge the pack fully in the Icom dock until the charge indicator clears, then reinsert — the bar indicator will reflect the correct full-charge voltage of approximately 8.4V.

Compatible Models

IC-M71 IC-M72 IC-M73 IC-M73 Euro IC-M73 Plus

Replaces Part Numbers

BP-245 BP-245N BP-245H

Technical Specifications

Voltage7.4V
Amp Hours2100mAh
Capacity2100mAh
Rate15.54Wh
Net Weight107.6g /3.80 oz
Gross Weight177.6g /6.26 oz
Approximate Weight177.6g /6.26 oz
Dimension 77.52 x 55.00 x 21.10mm

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-M71 transmits fine at low volume but cuts out completely when I key up on channel 16 — is the battery at fault?

Channel 16 watch mode and high-volume transmit draw more current than low-power voice monitoring. If the pack voltage sags below the IC-M71's transmit threshold during that spike, the BMS trips and the radio drops out. This is common with a new pack that hasn't completed its first full charge cycle. Charge fully until the dock indicator clears, then retest — the cutout should stop once the pack is at its full operating voltage of around 8.4V.

My Icom charger dock shows a fault LED every time I insert the new BP-245 — it never switches to charging.

The dock fault LED triggers when the contact strip doesn't complete a clean electrical handshake with the BMS. Salt residue, condensation, or factory protective film on the gold contacts is the most common cause in marine environments. Remove the pack, wipe the gold contact strip on both the battery and the dock cradle with a dry cloth, then reseat firmly. If the fault LED clears, charging will begin — if it persists after three clean insertions, check that the pack voltage reads at least 6.0V at the contacts with a multimeter, as the dock will not accept a pack below its minimum acceptance threshold.

The radio runs fine at the start of a trip but drops to noticeably weaker TX audio after extended use — what's happening?

Sustained RF output over a long shift draws continuous high current, and as the pack discharges toward its lower voltage threshold the IC-M71 reduces transmit power automatically to protect the BMS. This is a voltage sag response built into the radio's power management, not a defective cell. The BP-245 pack has a nominal capacity of 2100mAh, which the radio depletes faster under constant transmit use than standby monitoring. When TX audio weakens noticeably, check the bar indicator — if it shows one bar, dock the pack and recharge before the next shift.

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