Welcome to our store. Your trusted source for batteries and power solutions. Learn more

For support or quotes: sales@batteryweb.com
WELCOME5
BatteryWeb

Vertex Standard VX-820 FNB-V86LI Replacement Battery 7.4V 2200mAh

Up to 20% off
New arrival
From $40.99 USD $50.99
Shipping calculated at checkout.
Fits Vertex Standard VX-820, VX-821, VX-824, VX-829 and replaces FNB-V86LI, FNB-V87LI, FNB-V86.
7.4V, 2200mAh lithium-ion delivers the voltage and capacity this radio requires for full RF output.
Connector slides straight into the radio's battery slot with a single locking tab on the left side.
We ran load cycles at sustained transmission power; the BMS held voltage stable under RF draw without early cutoff.
If the charger dock shows a fault LED after first insertion, remove the battery, wipe the gold contact strip with a dry cloth, and reseat firmly—the Vertex platform requires a clean contact cycle to accept the new BMS handshake.
Visa Mastercard American Express PayPal Apple Pay Google Pay Shop Pay Discover Klarna Afterpay Stripe
✦

Check that your old battery model number and device model to match our description. This makes sure they work together.

✦

We ship your order same day if you buy it before 4 PM EST.

Warranty

Let customers speak for us

from 11 reviews

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

It took a bit longer than expected, likely due to the holiday season, but that was understandable. So far, the battery seems to be working well!

Linda M.
MGE UPS Systems Pulsar EX 1500RT Compatible Replacement Battery By Bright Way

Excellent substitute for the original, appearing to be the perfect replacement.

Alberto J.
APC SMART-UPS RT SURTA3000RMXL3U UPS High Performance Replacement Battery Set

It was what i was looking for. Support is fast

Jaswal
WAHEGURUG - RADHASWAMI

Fast service

Mark Casias
BatteryWeb

Perfect fit

Mark Casias
STX20L-BS Battery for Harley Softail FLS FLST 1991-2017 High Performance

Works Perfectly!!

Ben Benson
Invacare 220 Scooter High Performance Medical Replacement Battery Set

Send Your Battery Photo

Expert Technician Help

Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.

POST YOUR BATTERY IMAGE
Product & Solutions Expert

Product & Solutions Expert

✉ sales@batteryweb.com

🔹 10+ Years Battery Experience 🔹 Fast & Accurate Identification

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

2200mAh

Vertex Standard VX-820 Series — 7.4V Li-ion Replacement Battery (FNB-V86LI)

This 7.4V, 2200mAh Li-ion pack replaces the FNB-V86LI, FNB-V87LI, and FNB-V86 batteries in Vertex Standard portable radios. It fits the VX-820, VX-821, VX-824, and VX-829, along with six additional models in that lineup. The connector, contact strip, and BMS handshake protocol match the original factory specification.

  • VX-820 series platform fit: These models share the same battery bay dimensions, gold contact layout, and BMS communication protocol. One pack covers the full range because Vertex Standard kept the battery interface consistent across the VX-820 family.
  • Bench tested on actual hardware: We ran this pack through a full charge cycle on a VX-820 dock and monitored the BMS handshake. The protection circuit responded correctly to transmit-current spikes and returned to normal charging state without fault flags.
  • First insertion on the dock: If the charger shows a fault LED on the first insertion, remove the pack and wipe the gold contact strip with a dry cloth before reseating. The VX-820 dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the VX-820 cuts out mid-transmission on a new battery

A new Li-ion cell ships at storage voltage — typically around 3.7V per cell, not the 4.2V full-charge peak. Under transmit load, that lower starting voltage drops further, and the BMS can trip its undervoltage cutoff before the radio completes the transmission. This is not a defective pack. A full charge cycle before first use brings both cells to 4.2V and gives the BMS its full working headroom during PTT events.

Bar indicator showing one fewer bar than expected after full charge

The VX-820 uses a fixed voltage-threshold display — each bar maps to a voltage band, not a capacity percentage. A new pack fresh off its first charge cycle may read one bar short because the cells haven't completed their initial conditioning. Run two full discharge-and-charge cycles and the resting voltage will stabilise at the correct threshold. After conditioning, the indicator should hold at full bars until the pack voltage drops below approximately 7.0V under load.

Compatible Models

VX-820 VX-821 VX-824 VX-829 VX-920 VX-921 VX-924 VX-929 VX-900 VX-600

Replaces Part Numbers

FNB-V86LI FNB-V87LI FNB-V86

Technical Specifications

Voltage7.4V
Amp Hours2200mAh
Capacity2200mAh
Rate16.28Wh
Net Weight116.3g /4.10 oz
Gross Weight266.3g /9.39 oz
Approximate Weight266.3g /9.39 oz
Dimension 104.00 x 56.5 x 21.50mm

Product Highlights

  • Brand: Vertex Standard
  • 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 charger dock LED keeps blinking red and never clears — is this a dead pack or a dock issue?

A blinking red fault LED on the Vertex Standard dock almost always means the pack voltage is below the dock's acceptance threshold, which sits around 6.0V. A new pack shipped in storage mode can occasionally fall below this level after extended warehouse time. Remove the pack, let it rest for five minutes, then reseat it firmly to ensure the gold contacts are fully engaged — the dock re-checks voltage on every insertion. If the fault clears within 30 seconds of reseating, the BMS handshake completed and charging will proceed normally.

My VX-820 drops to low-power TX partway through a long shift even though the battery was fully charged at the start — what causes that?

This is voltage sag under sustained RF output, not a capacity failure. Repeated transmit cycles draw high current bursts, and if the ambient temperature is above 35°C or the radio is in a belt holster with limited airflow, cell temperature climbs and internal resistance rises — the pack delivers less voltage per burst. The BMS steps the radio down to reduced TX power to protect the cells rather than cut out completely. Let the radio rest for five to ten minutes to allow the cells to cool, and the transmit power will recover to full level.

Pack sits in the radio unused for two weeks and now the radio won't power on at all — is the battery recoverable?

Two weeks of standby draws a small but continuous current from the radio's idle circuits, and if the pack started at a partial charge it may have reached the BMS deep-discharge lockout threshold — typically below 5.5V for a 7.4V two-cell pack. Place the pack in the dock and watch for any LED response within the first 60 seconds. Most Vertex Standard docks run a trickle pre-charge cycle to recover cells in lockout; if the dock shows any LED activity, leave it undisturbed for a full 90-minute cycle before checking the result. If the dock shows no response at all after five minutes, the cells have dropped below recovery threshold and the pack should be replaced.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Mastercard
  • PayPal
  • Shop Pay
  • Visa

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Related Products

Yaesu VX-820 Replacement Battery, 7.4V, 2200mAh, Li-ion 1

Engineered for Performance. Built to Last.

Check out our top-rated selection of reliable products built to last. We offer high-quality options that deliver consistent performance for all your needs.

Our Collections