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Sanyo 23620 Cordless Phone Compatible Battery 3.6V 1200mAh

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Fits Sanyo 23620 cordless phone handsets and compatible DECT models; replaces OEM Ni-MH pack 3KR600AAL and cross-reference packs 3KR800AAE, 3N600AA(MRX).
3.6V, 1200mAh Ni-MH chemistry delivers standard talk time on DECT handsets; voltage supports base station charging circuit without error codes.
Battery slides into handset battery compartment with flat connector tab; locking notch aligns with housing slot for secure seating.
Bench testing confirmed proper voltage acceptance at base station charger and stable discharge curve under typical cordless phone RF load cycling.
After installation, place handset in base for a full 16-hour charge before first use — NiMH cells need slow charging to reach rated capacity on initial cycles.
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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

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⚠️ 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

1200mAh

Sanyo 23620 Series — 3.6V Ni-MH 1200mAh Replacement Battery

This is a 3.6V, 1200mAh Ni-MH replacement battery for Sanyo cordless phone handsets, including models 23620, 3KR600AAL, 3KR800AAE, 3N600AA(MRX), and over 54 additional compatible models. It replaces the original rechargeable pack when the handset stops holding a charge or loses talk time. Dimensions are 50.43 x 42.54 x 14.40mm — confirm these against your existing battery before ordering.

  • Broad Sanyo handset compatibility: These models share the same 3.6V three-cell Ni-MH configuration, connector orientation, and physical footprint, which is why a single pack covers the full range. The cell arrangement is AA-format, so voltage delivery matches the base station's charge circuit without modification.
  • Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a compatible handset base. The charging circuit accepted the battery immediately, and the BMS held steady through RF transmit load without triggering a cutoff.
  • First charge on Ni-MH cordless handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells in cordless phones arrive partially discharged from storage — skipping the slow initial charge leaves usable capacity on the table for the first several cycles.

Range reduction under RF load with a new Ni-MH pack

When a Ni-MH cell is under-conditioned or sitting below full capacity, the transmit burst drawn by the DECT radio causes a brief voltage sag. That sag can drop output power enough to shorten effective range, even if the battery reads as charged. The issue is most noticeable in the first three to five cycles after installation. Running the pack through several full charge-and-use cycles brings internal resistance down and stabilises voltage under RF load.

Base station charge light stays off or shows error after swap

Sanyo base stations use a delta-V detection method to confirm a Ni-MH pack is present and accepting charge. A battery that has discharged below the base's acceptance threshold during storage may not trigger that detection, so the charge indicator never lights. Remove the handset, leave it out of the base for 30 seconds, then re-seat it firmly. If the error persists, apply a trickle charge by leaving the handset docked overnight — most base stations will recover a deeply discharged pack within 12–16 hours and resume normal charge indication once voltage climbs above 3.0V.

Compatible Models

23620 3KR600AAL 3KR800AAE 3N600AA(MRX) CASA900 CASA9000 CLT2400 CLT2410 CLT2415 CLT2420 CLT2425 CLT2430 CLT2435 CLT9081 CLT908A CLT9109 CLT917 CLT9171 CLT918 CLT9181 CLT919 CLT920 CLT926 CLT9261 CLT927 CLT937 CLT947 CLT957 CLT9571 CLT9581 CLT966 CLT9661 CLT968 CLT9810 CLT9812 CLT9819 CLT9820 CLT9839 CLT9840 CLT9861 CLT9901 CLT9902 CLT9903 CLT9904 CLT9905 CLT9909 CLT9920 CLT9930 CLT9950 CLT9960 CLT9965 CLTA900 CLTA901 CLTA9011 CLTA902 CLTA903 CLTA905 GESPCF01

Technical Specifications

Voltage3.6V
Amp Hours1200mAh
Capacity1200mAh
Rate4.32Wh
Net Weight40.3g /1.42 oz
Gross Weight90.3g /3.19 oz
Approximate Weight90.3g /3.19 oz
Dimension 50.43 x 42.54 x 14.40mm

Product Highlights

  • Brand: Sanyo
  • 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

Talk time is noticeably shorter than my old battery — did I get a dud?

Almost certainly not. Ni-MH cordless phone batteries need three to five full charge-and-use cycles before they deliver rated capacity. The cells leave storage partially discharged, and internal resistance stays elevated until the chemistry is fully conditioned. Run the pack through at least three full cycles — full 16-hour charge, full use until the low-battery tone, repeat — then reassess.

My handset lost its pairing with the base station after I swapped the battery — what happened?

Some DECT cordless phones store pairing data in volatile memory backed by the handset battery. Removing the battery fully resets that memory, dropping the registration. Re-register the handset from the base station menu — on most Sanyo models this is a "Register Handset" or "Paging" option held for five seconds on the base. Once re-registered, the handset will behave normally.

The handset battery drains completely overnight even when it's sitting in the base — what causes that?

This points to a seating issue rather than a battery fault. If the handset contacts are not fully aligned with the base cradle, the charging circuit never activates, and the handset runs on standby draw until the pack is flat. Remove the handset, wipe both contact points with a dry cloth, and re-seat it until you hear or feel it click into position. Confirm the charge light activates within 60 seconds of re-seating.

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