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Sony BP-T18 Cordless Phone Replacement Battery 3.6V 700mAh

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Fits Sony cordless phone handsets that accept BP-T18 or BP-T24 batteries, including SPP-933, SPP-934, and 76 additional Sony DECT models.
This 3.6V, 700mAh nickel-metal hydride cell restores talk time on handsets that have lost charge retention from age.
Battery slides into the handset compartment with a single locking tab that seats flush against the plastic frame.
We bench-charged this pack in a Sony base station — the BMS accepted the cell without error codes and held voltage under standby draw.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless phone batteries require slow charging to reach rated capacity.
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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

700mAh

Sony SPP-933 / SPP-934 Series — 3.6V Ni-MH Replacement Battery (BP-T18 / BP-T24)

This is a 3.6V, 700mAh nickel-metal hydride battery that replaces the BP-T18 and BP-T24 in Sony cordless phone handsets. It fits the SPP-933, SPP-934, and over 76 additional Sony cordless phone models that share this battery format. The cell matches the original voltage and physical footprint, so no modification is needed at installation.

  • SPP-900 series compatibility: These Sony models share a common 3.6V single-cell NiMH architecture with an identical connector and housing profile. The BP-T18 and BP-T24 are interchangeable across this platform because Sony used the same battery bay and charge circuit across the range.
  • Bench tested on actual hardware: We cycled this battery through charge and discharge on compatible Sony handsets. The BMS accepted charge from the base station without triggering an error light, and voltage held steady across the full discharge curve during standby and active talk states.
  • First charge on NiMH cordless handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones require a slow initial charge to reach rated capacity — skipping this step will leave the battery short of its 700mAh potential for the first several cycles.

Range reduction after fitting a new NiMH pack

DECT handsets regulate transmit power partly based on available voltage from the battery. A new NiMH cell that hasn't completed its first conditioning cycles will sag under RF load, causing the handset to pull back transmit power. This looks like reduced range — walls that were never a problem suddenly drop the call. Run three to five full charge and discharge cycles through the base station and the voltage sag will tighten up, restoring normal RF performance.

Handset loses DECT pairing after battery replacement

Some Sony DECT handsets store pairing data in volatile memory that clears when power is fully interrupted during a battery swap. The handset powers on normally but shows no base connection or flashes the link indicator. To re-pair, press and hold the page or find button on the base station until the handset picks up the registration signal — typically within 30 seconds. Once paired, voltage should read at or above 3.6V at the handset terminals to confirm the new battery is seated correctly.

Compatible Models

BP-T18 BP-T24 SPP-933 SPP-934 SPP-A1050 SPP-A1070 SPP-A1071 SPP-A900 SPP-A9276 SPP-A946 SPP-A957 SPP-A967 SPP-A968 SPP-D900 SPP-ER1 SPP-ER101 SPP-N1020 SPP-N1025 SPP-S2430 SPP-S9226 SPP-SS950 SPP-SS951 SPP-SS955 SPP-SS960 SPP-SS961 SPP-SS965 SPP-SS966 SPP-SS967 FF5000 FF5500 FF901 FF950 SYLVANIA ST88201 ST88207 BBTY0623001 BPT18 BT1006 BT800 BT905 CDU5160 CEZAI998 CP355 CXAI5198 CXAI5698 EXT1160 EXT1165 EXT1265 EXT1365 EXT1760 EXT1865 EXT3165 EXV990 EZI996 FF4500 SPP933 SPP934 SPPA1050 SPPA1070 SPPA1071 SPPA900 SPPA946 SPPD900 SPPER1 SPPER101 SPPN1020 SPPN1025 SPPSS950 SPPSS960 TRU241 TRU246 TRU248 TRU341 TRU3455 TRU346 TRU3465 TRU3466 TRU348 TRU3485 TRU546 TRU548

Replaces Part Numbers

BP-T18 BP-T24

Technical Specifications

Voltage3.6V
Amp Hours700mAh
Capacity700mAh
Rate2.52Wh
Net Weight64.3g /2.27 oz
Gross Weight114.3g /4.03 oz
Approximate Weight114.3g /4.03 oz
Dimension 50.79 x 42.40 x 14.23mm

Product Highlights

  • Brand: Sony
  • 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 Sony cordless phone shows a shorter talk time than the old battery even after a full overnight charge — is the new battery faulty?

Almost certainly not. NiMH cordless phone batteries need three to five full charge and discharge cycles before they reach rated capacity — 700mAh on the first cycle is rare. The base station's trickle charge circuit conditions the cells gradually, so talk time steps up noticeably with each cycle. Run the handset down to the low battery warning, return it to the base for a full 16-hour charge, and repeat that three times before drawing any conclusions.

The base station shows a charging error light or no charge indicator after I fitted the new battery — what's causing it?

NiMH batteries drop to a low resting voltage during storage, and some Sony base stations reject a pack that presents below their acceptance threshold. Remove the handset, leave it out of the base for 60 seconds, then reseat it firmly — a solid connection is required for the charge pins to register. If the error persists, check that the battery contacts are clean and that the pack is clicking fully into the handset bay before returning it to the base.

The handset battery drains completely overnight even when it's sitting in the base — why isn't it staying charged?

This is a seating issue, not a battery fault. If the handset isn't fully clicked into the cradle, the charge pins lose contact and the handset runs on the battery in standby rather than drawing from the base. Lift the handset out, check the charge contacts on both the handset and base for dirt or corrosion, wipe them with a dry cloth, and reseat the unit until you hear or feel it click. A correctly seated handset should read a steady charge indicator within a few minutes of docking.

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