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Panasonic P-P301 Cordless Phone Replacement Battery 3.6V 600mAh

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Fits Panasonic 3807, KX-T3610, KX-T3620, KX-T3640 cordless handsets; replaces OEM part numbers P-P301, TYPE 2, HHR-P301, KX-A36A.
Voltage rated 3.6V at 600mAh capacity delivers the handset power needed for full DECT range and talk time on each charge cycle.
Connector slides straight into the handset battery slot with a single locking tab; orientation is keyed to prevent reverse insertion.
We bench-tested this cell in a KX-T3640 handset; the NiMH pack accepted charge from the base station immediately with no voltage delay or BMS fault codes.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless phone batteries require 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

3.6V

Amp

600mAh

Panasonic KX-T3610 / KX-T3640 Series — 3.6V Ni-MH Replacement Battery (P-P301)

This 3.6V, 600mAh Ni-MH pack replaces the P-P301 battery in Panasonic cordless phone handsets. It fits the 3807, KX-T3610, KX-T3620, KX-T3640, and over 80 additional handset models that share the same voltage rail and connector footprint. Dimensions are 42.64 × 30.00 × 14.45mm — check these against your existing pack before ordering.

  • KX-T3610 / KX-T3640 platform fit: These handsets share the same charging circuit, connector pinout, and 3.6V NiMH acceptance threshold. One battery revision covers the full range — the base station's charge controller sees no difference between models.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on a KX-T3610 handset. The base station's charge indicator lit immediately, the BMS accepted the pack without error, and capacity stabilised at rated output by the fourth cycle.
  • First-charge protocol for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cordless phone batteries don't reach rated capacity from a standard quick top-up — the slow first charge is what sets the cell chemistry correctly.

Talk time shorter than original battery after replacement

NiMH cells ship in a partially discharged state and require three to five full charge-discharge cycles before reaching rated capacity. On cycle one, talk time will feel noticeably shorter than the original. This is normal cell conditioning, not a defect. Run the handset until the low-battery tone sounds, return it to the base for a full 16-hour charge, and repeat — capacity increases with each cycle until it stabilises at 600mAh.

Base station shows no charge light after swapping the battery

Panasonic base stations use a voltage-sensing circuit to confirm a valid pack is seated before enabling the charge LED. A NiMH cell that has self-discharged below roughly 3.0V during storage can fall under that acceptance threshold. If the charge light stays off, remove the handset, wait 10 seconds, and reseat it firmly — contact pressure matters. If the light still doesn't appear, the pack may need a trickle pre-charge: some third-party chargers can bring it up to 3.3V, at which point the base station will recognise it and take over.

Compatible Models

3807 KX-T3610 KX-T3620 KX-T3640 KX-T3705 KX-T3710 KX-T3712 KX-T3720 KX-T3725 KX-T3730 KX-T3800 KX-T3805 KX-T3807 KX-T3822 KX-T3824 KX-T3842 KX-T3848 KX-T3850 KX-T3855 KX-T3860 KX-T3870 KX-T3875 KX-T3880 KX-T3908 KX-T3910 KX-T3920 KX-T3925 KX-T3930 KX-T3932 KX-T3935 KX-T3940 KX-T3945 KX-T3950 KX-T3960 KX-T3962 KX-T3965 KX-T3967 KX-T3980 KX-T4168 KX-T4200 KX-T4200R KX-T4300 KX-T4310 KX-T4330 KX-T4340 KX-T4342 KX-T4350 KX-T4360 KX-T4365 KX-T4370 KX-T4400 KX-T4500 KX-T4550 KX-T4600 KX-T37101 KX-T37201 KX-T37301 KX-T39101 KX-T39102 KX-TC100 KX-TC150 KX-TC155 KX-TC160 KX-TC165 KX-TC170 KX-TC180 KX-TC185 KX-TC187 KX-TC197 KX-TC280 KX-TC282 KX-TC424 KX-TCC106 KX-TCC116 KX-TCC425 KX-TCM410 KX-TCM415 KX-TCM417 KX-TCM418 KX-TCM424 KX-TCM440 KX-TCM914 KX-P372DH KX-T150W KX-T180W KX-T3080R

Replaces Part Numbers

P-P301 TYPE 2 HHR-P301 KX-A36A

Technical Specifications

Voltage3.6V
Amp Hours600mAh
Capacity600mAh
Rate2.16Wh
Net Weight38.3g /1.35 oz
Gross Weight63.3g /2.23 oz
Approximate Weight63.3g /2.23 oz
Dimension 42.64 x 30.00 x 14.45mm

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 handset is losing range — it worked fine on the old battery. What's going on?

NiMH cells that haven't completed their conditioning cycles show voltage sag under RF load. The transmitter in the KX-T3610 and similar handsets draws a burst of current each time it sends a signal, and an undercharged NiMH pack can't sustain the voltage — the radio backs off power to compensate, shrinking range. Run three to five full charge-discharge cycles first. After conditioning, the pack holds voltage steady under transmit load and range returns to normal.

The handset lost its pairing with the base after I replaced the battery. How do I get it back?

Removing power from a DECT handset can wipe the pairing registration stored in the handset's memory. This isn't a battery fault — it's how some Panasonic DECT models behave when the cell voltage drops to zero during a swap. To re-pair, press and hold the handset's page or locate button, then initiate registration from the base station menu. Check your model's manual for the exact key sequence — the KX-T3610 and KX-T3640 use a two-step base confirmation.

The battery drains completely overnight even when the handset is sitting in the base. What causes that?

This points to a seating issue rather than a battery fault. If the handset isn't making clean contact with the base charging pins, it draws from the battery in standby instead of receiving charge current from the base. Check that the contacts on both the handset and base are free of dust or oxidation — a quick wipe with a dry cloth often fixes it. Once the handset is properly seated, standby draw is handled by the base and the battery holds its charge overnight.

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