Panasonic HHR-P104 Cordless Phone Replacement Battery 3.6V 850mAh
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Panasonic HHR-P104 Cordless Phone Replacement Battery 3.6V 850mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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
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
⚠️ 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.
Panasonic HHR-P104 Cordless Phone Replacement Battery 3.6V 850mAh - is backordered and will ship as soon as it is back in stock.
Voltage
3.6V
Amp
850mAh
Panasonic KX-TG2302 / KX-TG2312 Series — 3.6V Ni-MH Replacement Battery (HHR-P104)
This is a 3.6V, 850mAh Ni-MH replacement battery for the Panasonic KX-TG2302 and KX-TG2312 series cordless phones. It replaces OEM part numbers HHR-P104, HHR-P104A, P104A/1B, and TYPE 29. The cell dimensions — 54.16 x 31.92 x 11.17mm — match the original battery bay exactly.
- KX-TG2302 / KX-TG2312 / KX-TG2313 compatibility: These handsets share the same 3.6V single-cell Ni-MH power rail, connector pinout, and battery bay geometry — which is why one part number covers the full range. No wiring or adapter changes needed.
- Bench tested on actual hardware: We cycled this pack through charge and discharge on the KX-TG2312 handset. The base station accepted the battery without error lights, and the BMS reached full-charge termination cleanly on the first slow-charge cycle.
- First-charge protocol for Ni-MH cordless packs: Place the handset in the base immediately after installing and leave it for a full 16 hours before the first call. Ni-MH cells shipped from storage are partially discharged — skipping the slow first charge leaves capacity on the table for the first several cycles.
Talk time shorter than rated after the first few charges
Ni-MH cells go through a conditioning period — typically three to five full charge and discharge cycles — before they deliver rated capacity. A new pack that seems weak in the first week is usually still conditioning, not defective. The chemistry requires repeated cycling to align the crystalline structure of the electrode material. Run the handset until the low-battery alert triggers, return it to the base for a full slow charge, and repeat for at least three cycles before judging capacity.
Base station showing a charging error or fault light after battery swap
Panasonic KX-TG bases use a delta-voltage detection circuit to confirm charging. If the replacement pack sits in storage long enough, its resting voltage can drop below the threshold the base expects on initial contact — causing a fault light instead of a charge indicator. Remove the handset, hold the power button for five seconds to discharge any residual capacitor charge, then reseat it firmly in the base. The base should re-detect the pack and begin a normal charge cycle once the cell voltage climbs above roughly 1.1V per cell.
Compatible Models
Replaces Part Numbers
Technical Specifications
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-TG2312 handset drains completely overnight even when it's sitting in the base — is the new battery faulty?
This is almost always a seating issue, not a faulty cell. If the handset isn't clicked fully into the base cradle, the charging contacts don't make reliable contact and the handset runs on battery in standby instead of drawing from the base. Press the handset firmly into the cradle until you feel it seat, then check that the charge indicator light appears on the base. If the light still doesn't show, clean the handset and cradle contacts with a dry cloth and reseat.
After swapping the battery, my KX-TG2302 handset lost its pairing with the base and won't register again — what happened?
Some Panasonic DECT handsets store pairing data in volatile memory that resets when power is fully removed — which happens during a battery swap. Re-registration takes about 60 seconds. On the base unit, press and hold the LOCATOR button for around five seconds until the base beeps, then go into the handset menu under Settings and select Register Handset. Follow the on-screen prompts and enter the PIN when asked — the default is usually 0000.
The handset range seems shorter after the battery swap — calls cut out in rooms where the old battery was fine.
Range drops when the handset's RF transmit circuit can't sustain voltage under the burst load of DECT transmission. A new Ni-MH pack in the first one to two conditioning cycles has slightly lower voltage delivery under load compared to a fully conditioned cell. Run three to five full charge and discharge cycles and retest range. If drop-outs persist after conditioning, check that the battery contacts inside the handset are straight and making full contact — a bent pin raises resistance and causes voltage sag at the exact moment the transmitter fires.
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