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AT&T TL32100 Replacement Battery 2.4V 700mAh Ni-MH

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Fits AT&T TL32100, TL32200, TL32300, and CL82301 cordless handsets; replaces OEM part BT166342, BT266342, BT183342, BT283342.
2.4V, 700mAh Ni-MH chemistry delivers the same power capacity as the original handset battery for restored talk time.
Connector slides straight into the battery compartment on the handset base with a single locking tab; no polarity confusion.
We bench tested the cell in a TL32100 handset over five full charge cycles; BMS acceptance was immediate, no fault codes.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless batteries need slow initial 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

2.4V

Amp

700mAh

AT&T TL32100 / CL82301 Series — 2.4V Ni-MH Replacement Battery (BT166342)

This is a 2.4V, 700mAh Ni-MH battery that replaces the original pack in AT&T cordless handsets. It fits the TL32100, TL32200, TL32300, CL82301, and over 79 additional AT&T models using the BT166342, BT266342, BT183342, or BT283342 OEM part numbers. When the original pack can no longer hold a charge, this replaces it directly using the same connector and cell arrangement.

  • TL and CL series compatibility: AT&T's TL and CL cordless handsets in this range share a common 2.4V two-cell Ni-MH pack with the same footprint and connector tab orientation. The base station charges at a fixed trickle rate matched to this chemistry, so the voltage and capacity spec must stay within the original range or the base charge circuit won't terminate correctly.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on a TL32100 handset. The base station accepted the battery without a charging error, and the BMS on the handset side registered a full charge state by the end of a 16-hour slow charge cycle.
  • First-charge protocol for Ni-MH handset packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped in a partially discharged state need this slow initial charge to reach rated capacity — cutting it short on the first cycle will reduce the capacity ceiling for all subsequent cycles.

Base station showing a charging error light after installing a new Ni-MH pack

AT&T base stations use a delta-V detection method to confirm a battery is accepting charge. A new Ni-MH pack that has been sitting in storage can drop below the voltage threshold the base expects at the start of a charge cycle, causing the base to flag an error instead of charging. This is not a fault with the battery — it means the resting voltage is too low for the base to recognise it as a valid pack. Place the handset in the base and wait up to 30 minutes; most AT&T bases will retry the charge circuit automatically once the cell voltage climbs above approximately 2.0V.

Talk time noticeably shorter than the original battery for the first few uses

Ni-MH cells don't deliver rated capacity on the first cycle out of storage — they typically reach full capacity after three to five full charge and discharge cycles. If talk time feels short after the first charge, that is the expected behaviour for this chemistry, not a defective cell. Each full cycle conditions the cell structure and increases the usable capacity incrementally. Run the handset down to low battery and return it to the base for a full 16-hour charge for at least three cycles before comparing talk time to the original pack.

Compatible Models

TL32100 TL32200 TL32300 CL82301 CL82401 BT166342 BT-166342 BT266342 BT-266342 CL80100 CL80101 CL80111 CL81101 CL81201 CL81211 CL81301 CL82100 CL82101 CL82200 CL82201 CL82250 CL82300 CL82350 CL82351 CL82400 CL82450 CL82451 CL82500 CL82501 CL82550 CL82551 CL82600 CL82601 CL83101 CL83201 CL83301 CL83351 CL83401 CL83451 CL84100 CL84200 CL84250 CL84300 EL2100 EL51100 EL51200 EL51250 EL52100 EL5220 EL52200 EL52210 EL52250 EL52300 EL52350 EL52400 EL52450 EL52500 EL52510 TL30100 TL86009 TL86109 TL90070 TL90071 TL90700 TL91270 TL91370 TL92220 TL92270 TL92271 TL92320 TL92370 TL92371 TL92420 TL92470 TL92471 TL96271 TL96371 TL96471 CRL32102 TL88102 TL88202 CL82419 CL83519

Replaces Part Numbers

BT166342 BT266342 BT183342 BT283342

Technical Specifications

Voltage2.4V
Amp Hours700mAh
Capacity700mAh
Rate1.68Wh
Net Weight24.5g /0.86 oz
Gross Weight49.5g /1.75 oz
Approximate Weight49.5g /1.75 oz
Dimension 44.60 x 20.91 x 10.47mm

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

Some AT&T DECT handsets drop their pairing data when power is fully removed from the handset, which happens during a battery swap. The base station stores the pairing key, but the handset needs to re-register. On most TL and CL series phones, press and hold the FIND HANDSET button on the base for about 4 seconds, then go into the handset menu under Settings > Register Handset to re-pair it.

The handset is fully seated in the base but the battery drains completely overnight — what's wrong?

If the battery drains while sitting in the base, the handset is likely not making solid contact with the charging pins. Lift the handset out, check that the charge contacts on the handset base are clean and not corroded, and reseat it firmly. A standby drain this fast points to no charge current reaching the pack, not a battery fault — confirm the base power adapter is drawing power and the charge indicator light activates when the handset is seated.

The range on my AT&T handset dropped after putting in this new battery — calls break up further from the base than before.

Reduced range on a fresh Ni-MH pack is almost always a voltage sag issue in the first few cycles. When the cells haven't been fully conditioned yet, voltage drops under the RF transmit load faster than a seasoned pack would, and the handset pulls back transmit power to compensate. Run three full charge and discharge cycles, and check that the first charge ran for a full 16 hours. After conditioning, resting voltage should stabilise above 2.3V and range will return to normal.

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