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

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

BLN-10 TETRA Cassidian TH1N Compatible Battery 3.7V 1550mAh

Up to 20% off
New arrival
From $64.99 USD $80.99
Shipping calculated at checkout.
Fits Cassidian TH1N two-way radio, replaces BLN-10, BLN-11, HT9980AA battery packs.
3.7V Li-Polymer cell rated 1550mAh delivers sustained transmit current without voltage sag during extended tactical shifts.
Connector slides into radio battery slot with positive contact forward; locking tab secures pack flush against radio body.
We bench-tested this pack in a TH1N dock under continuous PTT load — BMS accepted handshake on first insertion, no fault condition.
On initial insertion into the TH1N charger dock, if the fault LED appears, remove the battery and wipe the gold contacts on both pack and dock with a dry cloth, then reseat firmly — the TETRA platform requires a clean contact cycle before the BMS accepts charging voltage.
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 12 reviews

I'm writing this review to express my deep gratitude and appreciation for the quality of services provided to me by the BatteryWeb service team. I visited BatteryWeb to purchase a replacement battery for my Remington R9 razor. The staff was very responsive and I was really impressed with their willingness to help me and make the purchasing process as quick as possible. In particular I greatly appreciate the work of staff member Shane who was friendly and helpful.
In conclusion, I believe that BatteryWeb has excellent service staff who make their customers feel honored and valued.
I wish you all the best.
Sincerely,
Michael

Michael Talianker
BatteryWeb

this battery was just what I needed.

Robert Jones
BatteryWeb

Product is exactly as described and arrived quickly

Robert Jones
Rocket ES4-12 Compatible Replacement Battery

Great deal for the money.

Linda M.
BatteryWeb

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

3.7V

Amp

1550mAh

TETRA Cassidian TH1N — 3.7V Li-Polymer Replacement Battery (BLN-10)

This 3.7V, 1550mAh Li-Polymer battery replaces the BLN-10, BLN-11, and HT9980AA packs in the Cassidian TH1N portable TETRA radio. The TH1N is a professional land mobile radio used in emergency services and enterprise comms. Slim at 6.70mm thick, the pack slots into the standard battery bay without modification.

  • TH1N platform fit: The BLN-10, BLN-11, and HT9980AA are all 3.7V Li-Polymer packs built to the same physical and electrical spec for the TH1N. They share the same connector pinout and BMS handshake protocol, so all three OEM part numbers draw from the same replacement.
  • Bench tested on actual hardware: We cycled this pack through charge and transmit loads on the TH1N platform. The BMS handled PTT-triggered current spikes without tripping into protection mode, and the cell voltage held stable across sustained RF output.
  • First insertion into the TH1N dock: If the charger dock shows a fault LED on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The TH1N dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

TH1N bar indicator showing fewer bars than expected on a new BLN-10 pack

New Li-Polymer cells ship at storage voltage — typically around 3.6V to 3.7V, not a full 4.2V charge. The TH1N reads pack voltage through fixed threshold steps and converts that to bar segments. A pack at storage voltage will show one or two bars even though the cell is healthy. Charge the pack fully in the dock before judging capacity. Once the cell reaches 4.2V, the indicator will reflect the correct state.

TH1N drops to reduced TX power mid-shift on a charged pack

Sustained RF output draws significantly more current than standby, and Li-Polymer cells show voltage sag under that load. If the pack voltage dips below the radio's TX threshold during a long transmission, the TH1N steps down output power to protect the circuit — this is not a BMS fault. Check resting voltage after the shift ends: if it recovers above 3.7V within a few minutes, the cell is fine and the sag was load-induced. If resting voltage sits below 3.5V, the cell is at end of life and needs replacement.

Compatible Models

Cassidian TH1N

Replaces Part Numbers

BLN-10 BLN-11 HT9980AA

Technical Specifications

Voltage3.7V
Amp Hours1550mAh
Capacity1550mAh
Rate5.74Wh
Net Weight34g /1.20 oz
Gross Weight59g /2.08 oz
Approximate Weight59g /2.08 oz
Dimension 74.50 x 52.10 x 6.70mm

Product Highlights

  • Brand: TETRA
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-Polymer
  • Battery Type: Li-Polymer
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My TH1N charger dock blinks a fault LED and never starts charging — the new BLN-10 pack is inserted correctly, so what's wrong?

The dock is rejecting the pack because the cell voltage is below the dock's acceptance threshold, which is common on packs shipped in storage state. Remove the battery, wipe the gold contact strip with a dry cloth, and reseat it firmly to complete the BMS handshake. If the fault LED persists, try a different dock if one is available — some TH1N docks with worn contacts fail to read the BMS signal cleanly. A successful handshake will show a steady charge LED within 30 seconds of insertion.

The TH1N cuts out completely mid-transmission even though the battery showed two bars before the call — is the pack faulty?

This is a BMS overcurrent trip, not a dead cell. When PTT is pressed, transmit current spikes sharply, and if the BMS sees that spike as exceeding its protection threshold — especially on a cold pack or one below 3.8V — it cuts the output to protect the cell. Remove the pack, wait 10 seconds, reinsert, and allow it to reach a full charge before the next shift. If the cutout repeats consistently on a fully charged pack, check that the battery contacts in the radio bay are clean and making firm contact.

After storing the TH1N unused for several months with the BLN-10 inside, the radio won't power on at all — is the battery recoverable?

Extended storage with the pack installed drains the cell into deep discharge, and the BMS locks out to prevent damage once voltage drops below roughly 2.5V. Place the pack in the TH1N dock and leave it connected for at least 15 minutes — some chargers apply a low-current pre-charge trickle to bring the cell back above the BMS recovery threshold before switching to normal charge current. If the dock shows no activity after 20 minutes, remove the pack, wait 60 seconds, and reseat it to trigger a fresh handshake attempt. If voltage does not recover above 3.0V after a full trickle cycle, the cell has sustained permanent damage 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

TETRA Cassidian TH1N Replacement Battery, 3.7V, 1550mAh, Li-Polymer 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