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

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

TETRA SC20 Replacement Battery 7.4V 3300mAh Li-ion

Up to 20% off
New arrival
From $50.99 USD $62.99
Shipping calculated at checkout.
Fits TETRA SC20, STP9000, STP9040, and STP9200 two-way radios as direct OEM replacement.
7.4V lithium-ion at 3300mAh delivers sustained transmission power without mid-shift voltage sag on this platform.
Gold connector slides straight into the SC20 battery slot with positive terminal forward and locking tab engaged firmly.
We bench tested this cell on a SC20 transceiver — BMS accepted the pack within two charge cycles and showed stable voltage under sustained PTT load.
On first insertion into the SC20 charger dock, if the fault LED appears, remove the battery, wipe both gold contact strips with a dry cloth, and reseat firmly.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
WECARE5

Please Confirm Delivery Timeline

Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
4.8
★★★★★
★★★★★
Average Customer Rating
By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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

3300mAh

TETRA SC20 / STP9000 Series — 7.4V Li-ion Replacement Battery

This 7.4V, 3300mAh lithium-ion battery replaces the original pack in the TETRA SC20, STP9000, STP9040, STP9200, and compatible variants in the same platform family. It fits the same battery bay and connects to the same contact strip used across this TETRA TETRA series. Voltage and capacity match the OEM specification exactly.

  • SC20 and STP9000-series platform fit: The SC20, STP9040, and STP9200 share the same battery form factor, contact layout, and BMS handshake protocol. One pack covers the full platform because the voltage rail and connector footprint are common across these TETRA models.
  • Bench tested on actual hardware: We ran this pack in an SC20 dock and monitored the BMS initialisation cycle. The protection circuit accepted the charge current without tripping, and the radio recognised the pack and moved through all bar indicator states as expected under load.
  • First insertion into the dock: If the charger dock shows a fault LED on first insertion, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TETRA platform requires a clean contact cycle before the dock accepts the new BMS handshake and begins charging.

Why the SC20 cuts out mid-transmission on a new battery

During PTT, the SC20 draws a short, sharp current spike to power the RF output stage. If the BMS interprets that spike as an overcurrent event, it trips and disconnects the cell — dropping the transmission instantly. This is more common at storage voltage, where internal impedance is slightly elevated and the BMS threshold is easier to hit. The fix is to seat the pack in the dock and let it charge to at least 7.0V before first use, which lowers impedance and brings the spike within the BMS acceptance window.

Bar indicator showing one fewer bar than expected on a new pack

New cells ship at storage voltage — typically around 3.6–3.7V per cell, or roughly 7.2–7.4V for the pack. The SC20's voltage-threshold bar indicator reads that as one bar below full, which looks like a fault but is not. A full charge cycle brings the pack to approximately 8.4V, and the indicator will move to the correct level. Do not return the pack before completing one full charge from the dock.

Compatible Models

SC20 STP9000 STP9040 STP9200 STP8020 STP8100 STP9035 STP9080 SC2020 STP8200 STP9038 STP9100 SC2024 STP8000 STS8000 STP8038 STP8030 STP8035 STP8040 STP8080

Technical Specifications

Voltage7.4V
Amp Hours3300mAh
Capacity3300mAh
Rate24.42Wh
Net Weight112.4g /3.96 oz
Gross Weight182.4g /6.43 oz
Approximate Weight182.4g /6.43 oz
Dimension 82.25 x 52.50 x 22.10mm

Product Highlights

  • Brand: TETRA
  • 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 SC20 cuts out the moment I press PTT — is the new battery faulty?

This is a BMS overcurrent trip, not a dead cell. The transmit current spike on PTT briefly exceeds what the BMS allows at storage voltage, where cell impedance is slightly higher than normal. Charge the pack fully before first use — once it reaches 8.4V, impedance drops and the spike stays inside the BMS acceptance window. If it still cuts out after a full charge, check that the contact strip is clean and seated flat.

The dock LED has been blinking amber for two hours and never switches to green — what's wrong?

A new pack shipped at storage voltage can sit below the minimum voltage the dock will accept for a standard charge cycle. Remove the pack, wait 30 seconds, and reseat it firmly — the dock needs a clean contact cycle to re-read the BMS and restart the charge sequence. If the fault LED persists, wipe the gold contacts on both the pack and the dock with a dry cloth before reinserting. The pack should begin charging once the dock registers a voltage above its acceptance threshold.

The radio drops to noticeably weaker TX output after a few hours of heavy use — is the battery draining too fast?

This is voltage sag under sustained RF load, not early depletion. As the pack discharges, voltage drops under the continuous draw of repeated transmissions, and the SC20 automatically reduces TX power to stay within operating limits. It is normal behaviour tied to the cell's state of charge, not a fault with the pack. If the drop happens within the first hour of a fully charged pack, check that the contacts are clean and that the pack is fully seated — a partial connection raises contact resistance and accelerates sag.

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

Simoco-Sepura Tetra STP8000 Replacement Battery, 7.4V, 3300mAh, 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