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AT&T 3101 Cordless Phone Replacement Battery 2.4V 700mAh

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Fits AT&T 3101, 3111, and BT8001 cordless handsets; replaces OEM 2SNAAA70H-SX2F, BT8001, and 89-1335-00.
2.4V nominal voltage and 700mAh capacity restore full talk and standby time on DECT handsets that won't hold charge.
Cylindrical AAA form factor with solder tabs; seats into handset battery compartment with spring-loaded contact pressure.
We bench tested the 2SNAAA70H-SX2F under simulated handset RF load and confirmed BMS voltage stability across five full charge cycles.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless phone batteries require a slow first charge 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

2.4V

Amp

700mAh

AT&T 3101 / SL82000 Series — 2.4V Ni-MH Replacement Battery (2SNAAA70H-SX2F)

This is a 2.4V, 700mAh Ni-MH replacement battery for the AT&T 3101 cordless phone handset. It also fits the 3111, BT8001, and SL82000 series. It restores the handset's ability to hold a charge when the original cell has degraded beyond use.

  • 3101 / SL82000 platform fit: These models share the same 2.4V two-cell NiMH pack format, connector pinout, and base station charge circuit. The 2SNAAA70H-SX2F cross-references directly to OEM part BT8001 and 89-1335-00, covering the full handset lineup without modification.
  • Bench tested on actual hardware: We cycled this pack through the AT&T base station charge circuit and confirmed the NiMH acceptance voltage triggered correctly. The BMS-equivalent charge termination in the base responded to peak voltage detection without error or fault indication.
  • First-charge conditioning 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 at storage charge won't reach rated capacity on a short first cycle — the slow initial charge lets each cell equalise and reach its full 700mAh rating.

Base station charge light not activating on a new NiMH pack

AT&T base stations on the 3101 and SL82000 series use delta-V detection to confirm a battery is present and accepting charge. A new NiMH pack sitting in warehouse storage can drop to a voltage the base reads as an open circuit or fault. The fix is to check the battery contacts on both the handset and base cradle for oxidation, then reseat the handset firmly. If the charge light still doesn't activate, measure the pack voltage — anything below 1.8V total may need a short external boost charge before the base circuit will engage.

Range dropping mid-call after replacing the battery

DECT handsets on this platform draw a current spike during each transmit burst. If the NiMH pack hasn't completed its first full conditioning cycle, internal resistance is higher than rated, and voltage sags under that RF load. The handset interprets the voltage drop as a low-battery condition and reduces transmit power, which cuts range noticeably. Run three to five full charge-and-use cycles through the base station to condition the cells — internal resistance drops after each cycle and transmit voltage stabilises.

Compatible Models

3101 3111 BT8001 SL82000 SL82118 SL82208 SL82218 SL82308 SL82318 SL82408 SL82418 SL82518 SL82558 SL82658 AT-3201 AT-3211-2 BT-18433 BT-184342 BT-28433 BT-284342 BT-6010 BT-8000 BT-8001 BT-8300 CL74209 CL74309 CL80109 CL81109 CL81209 CL81309 CL82109 CL82209 CL82309 CL82359 CL82409 CL82509 CL82589 CL82609 CL82659 CL82859 CL84109 CL84209 CL84309 EL51109 EL51209 EL51359 EL52109 EL52209 EL52259 EL52309 EL52409 SL80108 SL81108 TL86009 TL86109 TL90078 TL92278 TL92328 TL92378 AT3201 AT3211-2 AT32112 BT18433 BT184342 BT28433 BT284342 BT6010 BT8000 BT8300

Replaces Part Numbers

2SNAAA70H-SX2F BT8001 89-1335-00

Technical Specifications

Voltage2.4V
Amp Hours700mAh
Capacity700mAh
Rate1.68Wh
Net Weight22g /0.78 oz
Gross Weight47g /1.66 oz
Approximate Weight47g /1.66 oz
Dimension 43.55 x 20.42 x 10.60mm

Product Highlights

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

Frequently Asked Questions

My AT&T 3101 talk time is much shorter than it used to be, even with the new battery installed — what's wrong?

NiMH cells don't hit rated capacity on the first cycle out of storage. The 700mAh rating requires three to five full charge-and-discharge cycles before the cells reach their true capacity. Place the handset in the base until fully charged, use it until the low-battery indicator activates, then return it to the base — repeat this five times. Talk time will increase noticeably with each cycle.

The handset lost its pairing to the base after I swapped the battery — how do I get it back?

Removing the battery from a DECT handset cuts all power, and some AT&T cordless models on this platform clear their pairing data when power is fully lost. Re-register the handset by pressing the page or find button on the base for several seconds until the handset enters registration mode, then follow the pairing sequence in the AT&T 3101 manual. If the base doesn't respond, unplug the base AC adapter for 30 seconds, reconnect, then attempt registration again.

The handset is draining completely overnight even though it's sitting in the base — is the battery faulty?

A fully seated handset in the base should draw trickle charge, not drain. If the battery is dropping to zero overnight, the handset isn't making proper contact with the base charging pins. Remove the handset, inspect both the handset charge contacts and the base cradle pins for dust or corrosion, and clean them with a dry cloth. Reseat the handset and confirm the charge indicator light activates — if there's no light, the contacts aren't connecting and the handset is running on battery with no top-up.

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