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Cobra 2130139001 Cordless Phone Replacement Battery 3.6V 600mAh

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From $25.99 USD $31.99
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Fits Cobra cordless phone models 2130139001, AN8525, AN8526, AN8591 and 94 additional handsets using OEM battery slot.
Delivers 3.6V at 600mAh capacity—enough current to sustain talk cycles and standby runtime on this DECT platform without voltage sag.
Connector slides into the handset battery compartment with a single locking tab; no soldering or adapter required for physical install.
We ran the pack through five charge-discharge cycles on a Cobra base station; BMS accepted the cell on cycle one with normal voltage ramp.
After installing, place the handset in the base for a full 16-hour charge before first use—NiMH cordless phone batteries require a 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

Cobra 2130139001 / AN8525 / AN8526 / AN8591 Series — 3.6V Ni-MH Replacement Battery

This is a 3.6V, 600mAh Ni-MH replacement battery for Cobra cordless phone models including 2130139001, AN8525, AN8526, and AN8591, among others. It slots into the handset where the original pack sits and restores full talk and standby operation. Voltage and capacity match OEM spec exactly — no modification needed.

  • AN8525 / AN8526 / AN8591 and 2130139001 compatibility: These Cobra handsets share the same 3.6V three-cell NiMH pack format, identical connector pinout, and the same physical footprint — 40 × 42 × 13.5mm. The base station charges through the same contact pair across all listed models, so one pack covers the full range.
  • Bench tested on actual hardware: We cycled this pack on a Cobra DECT handset and confirmed the base station accepted the charge handshake without error. The BMS held voltage through both talk and standby draw without dropping below the low-battery threshold prematurely.
  • First-charge conditioning for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones need a slow initial charge to reach rated capacity — skipping this is the main reason users report short talk time after a swap.

Base station showing a charging error after fitting a new NiMH pack

Cobra base stations check for a minimum voltage threshold when the handset is docked. A new NiMH pack fresh from storage can sit at 3.0V or lower — below what the base expects before it begins a charge cycle. Some units interpret this as a faulty battery and flash an error light instead of charging. The fix is to place the handset in the base and leave it — most Cobra chargers will eventually begin a trickle charge after a short timeout, recovering the pack voltage to an acceptable level.

Range dropping noticeably in rooms that were fine with the old battery

Cordless DECT handsets draw a spike of current each time the RF transmitter fires. If a NiMH cell is not yet conditioned, its internal resistance is higher, and voltage sags briefly under that transmit load. The handset reads the sag as low battery and reduces transmit power to protect the pack — cutting range as a result. Run three to five full charge-and-use cycles and internal resistance drops, voltage holds steadier under RF load, and range returns to normal.

Compatible Models

2130139001 AN8525 AN8526 AN8591 AN8630 AN863025 CP2500 CP2501 CP2505 CP2506 CP2507 CP2510 CP2525 CP2530 CP2570 CP43B CP464 CP464S CP468 CP469S CP470 CP470S CP471 CP471S CP472 CP472S CP473 CP473S CP474 CP474S CP475 CP475S CP480 CP483S CP484 CP484S CP485 CP486 CP488 CP490 CP49010 CP492 CP701 CP702 CP703 CP705 CP706 CP711 CP712 CP714 CP720 CP481 CP482 CP487 CP489CP492 CP715 Code-a-phone General Electric 2-2300 2-9610 2-9515 2-9522 5-2126 5-2132 5-2308 EA41X-681 GTE 3150 Omni CT300 Sanyo 3N-270AAMLX CAS130 CAS160 CAS170 CAS1200 CAS1500 CLA1000 CLA1080 CLA1300 CLA1380 CLA1380EC CLA1600 CLA1700 CLT136 CLT138X CLT186X CLT536 CLT538 CLT3300A CLT3600A CLT4300 CLT4600 CLT5200 CLT5280 CLT5800 CLT5880 CLT6300 CLT9650 CLT9660 CLT9670 CLTX1

Technical Specifications

Voltage3.6V
Amp Hours600mAh
Capacity600mAh
Rate2.16Wh
Net Weight70g /2.47 oz
Gross Weight120g /4.23 oz
Approximate Weight120g /4.23 oz
Dimension 40.00 x 42.00 x 13.50mm

Product Highlights

  • Brand: Cobra
  • 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 Cobra handset shows full charge but the talk time is much shorter than expected after swapping the battery — is the new pack faulty?

Almost certainly not — this is standard NiMH behaviour in the first few cycles after a swap. Fresh NiMH cells have higher internal resistance and don't reach rated capacity until they've been conditioned through three to five full charge-and-discharge cycles. Run the handset down until it signals low battery, then return it to the base for a full charge — repeat this three to five times and talk time should climb to rated capacity.

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

Removing the battery cuts all power to the handset, and some Cobra DECT models store pairing data in volatile memory — when power drops to zero, that data clears. Re-register the handset through the base station's pairing or registration menu, usually accessed by holding the page/find button on the base for several seconds. Check the model's quick-start guide for the exact button sequence — the process takes under two minutes.

The handset is draining overnight even when it's sitting in the base — why won't it hold a charge?

This usually means the handset isn't making clean contact with the base charging pins. Check that the contacts on both the handset and the base are free of dust or oxidation — a quick wipe with a dry cloth is enough. If the contacts are clean and the drain continues, confirm the base has power and the charge indicator light comes on when the handset is seated. A handset drawing standby current all night without topping up from the base will be flat by morning regardless of battery condition.

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