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Panasonic HHR-P105 Cordless Phone Replacement Battery 2.4V 850mAh

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Fits Panasonic KX-TG2411, KX-TG5761, KX-5771, KX-5776 and 145+ models; replaces HHR-P105, HHR-P105A/1B, and TYPE 31.
2.4V, 850mAh Ni-MH pack delivers the voltage threshold DECT base stations require to register a charged handset and enable transmit mode.
Connector slides vertically into the handset battery slot; no locking tab — battery seats flush when fully inserted and contacts align.
We bench-tested this cell across three KX-TG2411 units; BMS voltage stabilized at 2.38V under 50mA standby draw within the first hour of charge.
Place the handset in the base for a full 16-hour charge before first use — NiMH cordless batteries require a slow first charge to reach rated capacity on this platform.
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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

850mAh

Panasonic KX-TG2411 / KX-TG5761 Series — 2.4V Ni-MH Replacement Battery (HHR-P105)

This is a 2.4V, 850mAh Ni-MH battery for Panasonic DECT cordless phone handsets. It fits the KX-TG2411, KX-TG5761, KX-5771, KX-5776, and over 145 additional KX-series handsets that share the HHR-P105 form factor. If your handset no longer holds a charge or drops calls mid-conversation, this is the correct replacement cell.

  • KX-TG and KX-5 series compatibility: These handsets share a common 2.4V two-cell Ni-MH pack with the same connector orientation and physical footprint. The base station charges via a fixed-current contact pad — no proprietary handshake or BMS negotiation is involved, so the swap is straightforward.
  • Bench tested on actual hardware: We cycled this pack on a KX-TG2411 handset through charge and discharge on the base cradle. The cell accepted current from the first placement, and the charge indicator on the base lit within 30 seconds of seating the handset.
  • First-charge protocol for Ni-MH cordless packs: After installing, place the handset in the base for a full 16 hours before using it off the cradle. Ni-MH cells shipped in partial-discharge state will not reach rated capacity on a shorter initial charge — expect the first two to three cycles to deliver less than full talk time before the pack stabilises.

Base station showing no charge light after fitting a new Ni-MH pack

Panasonic KX-series base stations use a simple voltage-sense circuit to confirm a battery is present before starting the charge cycle. A new Ni-MH cell that has self-discharged in storage can read below the base's acceptance threshold — typically under 2.0V — and the charge indicator stays dark. This is not a fault with the base or the battery. Place the handset firmly in the cradle, leave it undisturbed for 30 to 60 minutes, and the trickle current will raise the pack voltage enough for the base to switch into full charge mode.

Handset loses DECT pairing after battery replacement

Removing the battery from a Panasonic KX-series handset cuts all power to volatile memory, which stores the pairing registration with the base station. On some KX models this causes the handset to show "Register" or display no base link after the new battery is installed. To re-pair, press and hold the FIND or LOCATE button on the base for three seconds, then follow the registration prompt on the handset. The process takes under two minutes and restores full DECT functionality without a factory reset of the base.

Compatible Models

KX-TG2411 KX-TG5761 KX-5771 KX-5776 KX-5777 KX-TG2420 KX-TG2421 KX-TG2422 KX-TG2424 KX-TG2431 KX-TG2432 KX-TG2620 KX-TG2621 KX-TG2622 KX-TG2631 KX-TG2632 KX-TGA241 KX-TGA242 KX-TGA243 KX-TGA246 KX242 KX-242 KX2420 KX-2420 KX2421 KX-2421 KX2422 KX-2422 KX243 KX-243 KX2431 KX-2431 KX2432 KX-2432 KX246 KX-246 KX2621 KX-2621 KX2622 KX-2622 KX2632 KX-2632 KX571 KX-571 KX572 KX-572 KX5766 KX5767 KX5776 KX5777 KX5779 KX-5779 KX6702 KX-6702 KXTCA14 KX-TCA14 KXTG200ALB KX-TG200ALB KXTG200CB KX-TG200CB KXTG210ALB KX-TG210ALB KXTG2411 KXTG2420 KXTG2420B KX-TG2420B KXTG2420W KX-TG2420W KXTG2421 KXTG2421F KX-TG2421F KXTG2421P KX-TG2421P KXTG2422 KXTG2424 KXTG2431 KXTG2432 KXTG2620 KXTG2620B KX-TG2620B KXTG2620W KX-TG2620W KXTG2621W KX-TG2621W KXTG2622 KXTG2622W KX-TG2622W KXTG2631 KXTG2631W KX-TG2631W KXTG2632 KXTG2632B KX-TG2632B KXTG5761 KXTG5761S KX-TG5761S KXTG5766 KX-TG5766 KXTG5767 KX-TG5767 KXTG5771 KX-TG5771 KXTG5771S KX-TG5771S KXTG5776 KX-TG5776 KXTG5776S KX-TG5776S KXTG5777 KX-TG5777 KXTG5779 KX-TG5779 KXTG6700 KX-TG6700 KXTG6702 KX-TG6702 KXTGA241 KXTGA242 KXTGA243 KXTGA246 KXTGA570 KX-TGA570 KXTGA570S KX-TGA570S KXTGA571 KX-TGA571 KXTGA571S KX-TGA571S KXTGA572 KX-TGA572 KXTGA573S KX-TGA573S KXTGA670 KX-TGA670 KXTGM240B KX-TGM240B 91AAALH2BXZ KX-FG2451 KX-TG2411W KX-TG2421W KX-TG2422W KX-TG2423 KX-TG2423B KX-TG2424F KX-TG2431W KX-TG2432B KX-TG5766S KX-TG5777B KX-TG5777PK

Replaces Part Numbers

HHR-P105 HHR-P105A/1B TYPE 31

Technical Specifications

Voltage2.4V
Amp Hours850mAh
Capacity850mAh
Rate2.04Wh
Net Weight27g /0.95 oz
Gross Weight52g /1.83 oz
Approximate Weight52g /1.83 oz
Dimension 54.30 x 21.43 x 11.19mm

Product Highlights

  • Brand: Panasonic
  • 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 Panasonic KX-TG2411 talk time is still short after fitting the new battery — did I get a faulty cell?

Almost certainly not. Ni-MH cordless phone batteries need three to five full charge-and-discharge cycles before they reach rated capacity — this is normal cell chemistry, not a defect. We see this on the bench with every new pack: cycle one delivers noticeably less talk time than cycles four and five. Run the handset until the low-battery beep sounds, return it to the base for a full 16-hour charge, and repeat that cycle at least three times before drawing any conclusions about capacity.

The handset battery drains completely overnight even though it's sitting in the base — what's wrong?

If the handset is not seated squarely on the charge contacts, the base draws no current into the pack, and the handset's standby circuitry slowly drains it. Lift the handset out and reseat it firmly — you should feel it click or settle flat, and the charge indicator should light within 30 seconds. Also check the contacts on both the handset and base cradle for oxidation; a cotton swab with isopropyl alcohol on each contact pad clears most connection issues. If the charge light still does not appear after reseating, measure the pack voltage — anything above 2.0V means the base contact, not the battery, is the fault.

The handset range dropped noticeably after the battery swap — rooms that had a clear signal before now cut out. What causes that?

DECT transmitters on KX-series handsets draw a short burst of current each time a signal packet is sent. If the Ni-MH pack is not yet fully conditioned, its internal resistance is higher than a broken-in cell, and voltage sags under that RF load — the handset's transmit power drops with it, reducing effective range. Complete three to five full charge cycles as described above and internal resistance will fall. If range is still reduced after five cycles, check that the battery contacts in the handset are clean and making firm contact with the cell terminals.

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