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Uniden BT-800 Cordless Phone Replacement Battery 3.6V 1300mAh

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New arrival
From $26.99 USD $33.99
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Fits Uniden 24-148, AE255 handsets; replaces OEM BT-800 and BT-905 battery packs.
3.6V and 1300mAh Ni-MH chemistry delivers full talk time and standby performance on DECT cordless systems.
Connector is a two-pin slide-lock design; seats vertically into handset battery compartment with locking tab facing down.
We bench-tested this pack on a Uniden base station — BMS voltage registers 3.6V nominal, accepts charge cycle without error codes.
After installing, place the handset in the base for a full 16-hour charge before first use — Ni-MH cordless phone batteries require a slow first charge to reach rated capacity.
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

3.6V

Amp

1300mAh

Uniden 24-148 / AE255 Series — 3.6V Ni-MH Replacement Battery (BT-800 / BT-905)

This is a 3.6V, 1300mAh Ni-MH rechargeable battery for Uniden cordless phone handsets, including the 24-148, AE255, BBTY0300001, and BBTY0444001 among many others. It replaces OEM part numbers BT-800 and BT-905. When the original pack stops holding a charge, this battery restores normal handset operation without replacing the whole phone system.

  • Broad handset compatibility: These Uniden models share the same 3.6V NiMH cell configuration, connector pinout, and charge-acceptance voltage range — so one battery pack covers over 160 handset variants without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on a Uniden handset cradle. The BMS accepted charge correctly at the base station voltage and held stable output across the RF transmit load without dropping below the handset's low-battery cutoff threshold.
  • First-charge protocol for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before use. NiMH cordless phone batteries do not reach rated capacity on a short first charge — skipping this step is the most common reason a new battery appears weak out of the box.

Range dropping after a battery swap on Uniden cordless handsets

NiMH cells that haven't been conditioned yet show a lower resting voltage than a fully cycled pack. When the handset's RF transmitter pulls current during a call, that low voltage sags further — and the handset responds by reducing transmit power to stay within operating limits. The result looks like a range problem, but it's actually a voltage problem. Run three to five full charge-and-discharge cycles through the base station and the transmit power will stabilise at its normal level.

Base station shows no charge light or error after installing a new battery

NiMH batteries discharged below approximately 3.0V during storage can fall outside the voltage window the base station uses to detect a valid battery. The charger circuit sees a voltage it doesn't recognise and either shows an error or does nothing. To recover, leave the handset seated in the base undisturbed for at least 30 minutes — most Uniden base stations apply a trickle current that slowly raises cell voltage until the charge circuit takes over. If the charge light comes on after that window, the pack is recovering normally.

Compatible Models

24-148 AE255 BBTY0300001 BBTY0444001 BBTY0449001 BT800 BT905 CDU5160 CEZAI998 CP355 CXAI5198 DXA6505 DXAI3288-2 DXAI4288-2 DXAI388-2 DXAI5188-2 DXAI5588-2 DXAI7288-2 DXI3286-2 DXI4286-2 DXI386-2 DXI5186-2 DXI5586-2 DXI7286-2 DXI986-2 EHD1200 EWCI936 EX1960 EX1980 EX2100 EX255 EX3101 EX3102 EX3800 EX3810 EX4100 EX4101 EX4102 EX4800 EX905 EX925 EX945 EX965 EXA2245 EXA2850 EXA2950 EXA2955 EXA3245 EXA3955 EXA6950 EXA7250 EXA7950 EXA8955 EXA915 EXA918 EXA950 EXAI2248 EXAI2248i EXAI2980 EXAI3248 EXAI3248i EXAI378 EXAI398 EXAI3985 EXAI4248 EXAI4248-2 EXAI5180 EXAI5580 EXAI6980 EXAI7248 EXAI7248i EXAI7980 EXAI8985 EXAI8985HS EXAI918 EXAI918i EXAI978 EXAI978i EXAI980 EXAI985HS EXI2246 EXI2926 EXI2960 EXI2965 EXI3226 EXI3246 EXI376 EXI386 EXI3965 EXI6960 EXI4246 EXI4246C EXI5160 EXI5560 EXI7246 EXI7246C EXI7926 EXI7960 EXI8600A EXI8965 EXI8966 EXI916 EXI917 EXI960 EXI975 EXI976 EXL8900 EXL8901 EXL8945 EXLA8950 EXLI8962 EXP2240 EXP2241 EXP2243 EXP2800 EXP2900 EXP2901 EXP2903 EXP2905 EXP3240 EXP3241 EXP4240 EXP4241 EXP6900 EXP7240 EXP7241 EXP7900 EXP7901 EXP7902 EXP7903 EXP7904 EXP8000A EXP91 EXP92 EXP93 EXP920 EXP97 EXS2010 EXS2050 EXS2060 EXS2080 EXS9005 EXT1160 EXT1165 EXT1265 EXT1365 EXT1760 EXT1865 EXT3165 EXV990 EZI996 TRU241 TRU246 TRU248 TRU341 TRU346 TRU348 TRU3455 TRU3465 TRU3466 TRU3485 TRU546 TRU548 XE895 XE965 XE985 XE8950

Replaces Part Numbers

BT-800 BT-905

Technical Specifications

Voltage3.6V
Amp Hours1300mAh
Capacity1300mAh
Rate4.68Wh
Net Weight71.8g /2.53 oz
Gross Weight121.8g /4.30 oz
Approximate Weight121.8g /4.30 oz
Dimension 50.57 x 42.47 x 14.35mm

Product Highlights

  • Brand: Uniden
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My new Uniden battery talk time is much shorter than the old one — is it defective?

It's almost certainly not defective — it's unconditioned. NiMH cells ship partially discharged and don't reach rated capacity until they've been through three to five full charge-and-discharge cycles in the base station. Run the handset down until it signals low battery, then seat it for a full 16-hour charge, and repeat that cycle at least three times. Talk time will increase noticeably with each cycle.

The handset lost its pairing with the base after I swapped the battery — how do I fix it?

Some Uniden DECT handsets store pairing data in volatile memory that resets when power is fully removed during a battery swap. The fix is to re-register the handset manually. On most Uniden models, press and hold the Page or Find button on the base station for five seconds, then follow the handset's on-screen registration prompt — the exact sequence is in the handset's setup guide under "registering a handset."

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

This points to the handset not making proper contact with the charging cradle rather than a battery fault. Check that the handset is fully seated — a slight tilt or debris on the charge contacts is enough to break the circuit while the handset's standby draw continues. Clean the gold contacts on both the handset and the base with a dry cloth, reseat the handset firmly, and confirm the charge indicator light activates within 30 seconds of placing it in the cradle.

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