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

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

Uniden TRU-C46 Replacement Battery BT-925 3.7V 750mAh

Up to 21% off
New arrival
From $21.99 USD $27.99
Shipping calculated at checkout.
Fits Uniden TRU-C46 and TRU-C56 handsets; replaces OEM part numbers BT-925 and BBTY0471001.
3.7V Li-ion cell rated 750mAh delivers full talk time and standby runtime on DECT systems without voltage sag under transmit load.
Connector slides into handset battery slot with positive terminal forward; locking tab seats flush against the compartment ledge.
We bench-tested this cell in a TRU-C46 base charger; BMS accepted voltage signature on first insertion and held steady through discharge cycles.
After installing, seat the handset fully in the base and let it charge for 16 hours before first use—Li-ion packs in DECT systems need a slow initial charge to calibrate the base station's fuel gauge.
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

3.7V

Amp

750mAh

Uniden TRU-C46 / TRU-C56 — 3.7V Li-ion Replacement Battery (BT-925)

This is a 3.7V Li-ion battery rated at 750mAh (2.78Wh), built to replace the OEM BT-925 pack in Uniden TRU-C46 and TRU-C56 cordless phone handsets. It fits the battery bay directly and connects via the same terminal layout as the original. Voltage and capacity match what the handset's charging circuit expects.

  • TRU-C46 and TRU-C56 compatibility: Both handsets run on the same 3.7V single-cell Li-ion platform and share the BT-925 form factor, connector pinout, and BMS handshake requirements. One replacement covers either model.
  • Bench tested on actual hardware: We ran this cell through charge acceptance and load discharge on the TRU-C46 handset. The BMS accepted the base station charge signal without fault, and voltage held stable across both talk and standby draw cycles.
  • First charge on Li-ion cordless handsets: After installing this battery, seat the handset in the base and leave it for a full uninterrupted charge before first use. Li-ion cells that ship in storage-state can trigger a shallow charge termination if pulled early — the base needs time to bring the cell up from its resting voltage to full capacity.

Why the TRU-C46 loses range after a battery swap

DECT handsets draw a spike of current each time they transmit to the base station. If the replacement battery's internal resistance is higher than expected — or if the cell hasn't completed its first full charge cycle — voltage sags under that RF transmit load. The handset's RF output drops to compensate, which shortens the usable range between handset and base. Running two or three full charge-discharge cycles brings the cell's internal resistance down and stabilises transmit voltage.

Handset not pairing with base after battery replacement

Removing the battery on some Uniden DECT handsets wipes the pairing registration stored in the handset's volatile memory. When the new battery is installed, the handset powers up without a stored base ID and shows no line or signal. To fix this, re-register the handset from the base station menu — on the TRU-C46, hold the FIND HANDSET button on the base for five seconds while the handset is powered on to re-initiate pairing.

Compatible Models

TRU-C46 TRU-C56

Replaces Part Numbers

BT-925 BBTY0471001

Technical Specifications

Voltage3.7V
Amp Hours750mAh
Capacity750mAh
Rate2.78Wh
Net Weight14.7g /0.52 oz
Gross Weight40g /1.41 oz
Approximate Weight40g /1.41 oz
Dimension 50.75 x 30.27 x 4.60mm

Product Highlights

  • Brand: Uniden
  • 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 TRU-C46 talk time is still short after putting in the new battery — is something wrong with it?

Nothing is wrong. Li-ion cells ship in a low storage-state charge, and the first one or two cycles often end early because the base station's charge timer kicks in before the cell reaches full capacity. Leave the handset in the base for a complete uninterrupted charge, then run it through two or three full charge-discharge cycles. Talk time should reach the rated level by the third cycle — if it hasn't, check that the handset contacts and base charging pins are clean and making solid contact.

The base station light stays red or shows a charging error after I installed the new battery — why won't it charge?

A Li-ion cell that has dropped below roughly 2.5V during storage can read as a fault to the base station's charge controller, which expects a cell already in the 3.0–3.7V range. Seat the handset firmly in the base and leave it for at least 30 minutes — most Uniden base stations will attempt a trickle pre-charge to bring the cell voltage up before switching to normal charge mode. If the error clears after that window, the charge completed normally. If the red light persists after an hour, clean the metal charge contacts on both the handset and the base with a dry cloth and reseat.

The handset battery drains completely overnight even when it's sitting in the base — what's causing that?

This is almost always a seating issue, not a battery fault. The handset needs firm, level contact between its charge terminals and the base pins to maintain a trickle charge during standby. If the handset sits at a slight angle or the base contacts are corroded, the charging circuit never activates and standby draw slowly pulls the cell down to flat. Wipe the charge pins on the base and the terminals on the handset with a dry cloth, reseat the handset, and confirm the charge indicator light activates — that light confirms the circuit is live and the cell is being maintained.

Payment & Security

Payment methods

  • American Express
  • Apple Pay
  • 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

Uniden TRU-C46 Replacement Battery, 3.7V, 750mAh, 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