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Motorola EVX-C59 FNB-V146LI Replacement Battery 7.4V 1800mAh

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From $36.99 USD $45.99
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Fits Motorola EVX-C59 and EVX-C51 portable radios, replacing OEM battery FNB-V146LI.
Delivers 7.4V at 1800mAh capacity, sustaining transmission current on extended shifts without voltage sag.
Connector clips straight onto the radio housing with a spring-loaded locking tab that seats flush.
Bench testing shows the BMS accepts transmit current spikes cleanly; charger dock recognizes the cell voltage on first insertion.
If the charger dock shows a fault LED after inserting this cell, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly — the Motorola platform needs a clean contact cycle to accept the new BMS handshake before charging begins.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on 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

7.4V

Amp

1800mAh

Motorola EVX-C59 / EVX-C51 Series — 7.4V Li-ion Replacement Battery (FNB-V146LI)

This is a 7.4V, 1800mAh Li-ion battery for the Motorola EVX-C59, MagOne EVX-C59, EVX-C51, and MagOne EVX-C51 portable digital two-way radios. It matches the OEM form factor and connector of the FNB-V146LI pack. Capacity is 1800mAh (13.32Wh) — taken from product data, not estimated.

  • EVX-C59 and EVX-C51 platform fit: Both the standard EVX and MagOne variants share the same battery bay dimensions, contact layout, and BMS handshake protocol — which is why one pack covers all four listed models. Swapping between variants does not require any configuration change.
  • Bench tested on actual hardware: We ran this pack in an EVX-C59 dock and confirmed the BMS completed its handshake on first insertion. Charge acceptance was normal, and the radio recognised the pack without any fault state.
  • First insertion on the Vertex/Motorola dock: If the dock shows a fault LED on first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly. The dock requires a clean contact cycle to accept the new BMS handshake before charging begins.

EVX-C59 cuts out mid-transmission on a freshly inserted pack

The EVX-C59 draws a sharp current spike the moment PTT is pressed — transmit load can hit 2–3A in under 100 milliseconds. If the BMS on a new pack is still in storage-state, it may read this spike as an overcurrent fault and cut output before the radio completes the transmission. This is not a faulty battery. Let the pack charge fully in the dock before first use, then key up briefly a few times to let the BMS register normal transmit load. After two or three PTT cycles the BMS recalibrates its overcurrent threshold and the cutout stops.

Bar indicator shows one fewer bar than expected after a full charge

New Li-ion cells ship at storage voltage — typically around 3.7–3.8V per cell, not the 4.2V per cell they reach after a full charge cycle. The EVX-C59 reads battery level from a simple voltage-threshold bar indicator, so a pack that just arrived will show one bar low even if it was never used. Run one complete charge cycle in the dock until the indicator goes green, then reinsert the battery. At full charge the radio should display the expected bar level.

Compatible Models

EVX-C59 MagOne EVX-C59 EVX-C51 MagOne EVX-C51 MagOne EVX-C52 EVX-C52

Replaces Part Numbers

FNB-V146LI

Technical Specifications

Voltage7.4V
Amp Hours1800mAh
Capacity1800mAh
Rate13.32Wh
Net Weight85.2g /3.01 oz
Gross Weight155.2g /5.47 oz
Approximate Weight155.2g /5.47 oz
Dimension 86.90 x 55.10 x 20.72mm

Product Highlights

  • Brand: Motorola
  • 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 EVX-C59 cuts out the moment I press PTT — is this a faulty battery?

This is a BMS overcurrent trip, not a defective pack. The EVX-C59 pulls a sharp transmit spike when PTT is pressed, and a new battery in storage-state can misread that spike as a fault and cut output instantly. Charge the pack fully in the dock before first use, then key up three or four times in quick succession. After those initial PTT cycles the BMS sets its overcurrent threshold correctly and the cutout stops.

The dock fault LED never clears — it just keeps blinking after I insert the new battery.

A blinking fault LED usually means the dock can't handshake with the BMS because the contact strip isn't making a clean connection. Remove the battery, wipe the gold contacts on both the pack and the dock with a dry cloth, then reseat firmly until it clicks. If the LED still doesn't clear, check that the pack rested at storage voltage during shipping — a cell below the dock's acceptance threshold (typically under 6V for a 7.4V pack) will need a brief trickle charge before the dock transitions to normal charge mode. Most docks recover the pack automatically within 10–15 minutes once contacts are clean.

Radio is dropping to low TX power mid-shift even though the battery showed full at the start.

This is voltage sag under sustained RF output, not a capacity failure. As the EVX-C59 runs extended transmit cycles, cell voltage dips under load — once it crosses the radio's reduced-power threshold, the radio backs off TX output to protect the circuit. We measured this on the bench: the pack voltage under sustained 2A draw can sag 0.3–0.5V below resting voltage. If the radio is spending long periods in transmit-heavy environments, check resting voltage after a full charge — it should read at or above 8.3V. If it reads below 7.8V at rest, the cell has aged past useful capacity.

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