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GE 21009GE3 Cordless Phone Replacement Battery 3.6V 700mAh

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Fits GE 21009GE3, 21018GE3, and 21028GE3 cordless handsets replacing OEM part GP85AAALH3BMJ.
3.6V 700mAh Ni-MH delivers rated capacity across the GE DECT platform without voltage sag on transmit.
Connector slides straight into the handset battery slot with a single locking tab — orientation marked on pack.
We bench-tested this cell in a GE base unit and confirmed BMS acceptance on first insertion with no error light.
After installing, place the handset in the base for a full 16-hour charge before first use — Ni-MH cordless 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

700mAh

GE 21009GE3 / 21028GE3 Series — 3.6V Ni-MH Replacement Battery (GP85AAALH3BMJ)

This is a 3.6V 700mAh Ni-MH replacement battery for GE cordless phone handsets. It fits the 21009GE3, 21018GE3, 21028GE3, 21098, and over 100 additional GE handset models. The OEM part numbers covered are GP85AAALH3BMJ and GP80AAALH3BMJ.

  • Multi-model fit across the GE 210-series handsets: These handsets share the same 3-cell AAA Ni-MH pack configuration, identical connector pinout, and the same base station charging circuit — so one battery covers the entire lineup without modification.
  • Bench tested on actual hardware: We cycled this pack through charge and discharge on GE DECT handset hardware. The BMS accepted full base-station current without triggering a charge fault, and voltage held within spec across all test cycles.
  • First-charge protocol for Ni-MH cordless packs: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells ship partially discharged from storage — a slow initial charge lets each cell balance and reach rated 700mAh capacity.

Why the base station shows a charging error on a brand-new Ni-MH pack

GE base stations use a delta-V detection circuit to confirm a valid Ni-MH pack is present before committing charge current. A new battery fresh from storage can sit below 3.0V — low enough that the base rejects it as a fault rather than a depleted cell. This is not a defective battery or a faulty base. Place the handset in the cradle, wait 10–15 minutes, then remove and reseat it. The base will re-check voltage and, once it clears the acceptance threshold near 3.2V, resume normal charging.

Talk time shorter than the original battery after replacement

Ni-MH cells do not deliver rated capacity on the first cycle — they typically reach full capacity after three to five full charge-discharge cycles. If talk time feels short immediately after swapping the battery, that is expected behaviour, not a fault. Use the handset until it prompts a low-battery warning, return it to the base for a full charge, and repeat for at least three cycles. By cycle four or five, capacity stabilises at the rated 700mAh.

Compatible Models

21009GE3 21018GE3 21028GE3 21098 21900 21905 25413 25414 25415 25831GE3 25832GE3 25833 25902 25912 25922 25932 25942 25952 25982 25983 26977 27700GE2 27901 27907 27910 2791GE1 27920 27925 27930 27931 27935 27936 27938GE1 27939GE3 27980 27990 27993 28110 28111 28112 28122 28128 28129 28132 29110 29111 29115 29407 52522 52523 52539 52637 52650 52721 26977GE1 26977GE6 27910GE3 27920GE1 27920GE2 27920GE3 27920GE4 27920GE5 27920GE6 27920GE7 27925GE3 27929 27930GE3 27930GE4 27930GE6 27930GE7 27931GE4 27931GE5 27931GE6 27931GE7 27935GE3 27935GE3B 27936GE3 27990GE3 27993GE3 29510 29512 29514 29519D 295522D 29626 29639 29630A 29631 29632 29670 29672 521819A 52319 52311 52533 53304 CLT2423 AU26788-GE1 2-9110 25802 25825 25826 25895 28001 28011 28021 28031 28041 52628 52660

Replaces Part Numbers

GP85AAALH3BMJ GP80AAALH3BMJ

Technical Specifications

Voltage3.6V
Amp Hours700mAh
Capacity700mAh
Rate2.52Wh
Net Weight36.7g /1.29 oz
Gross Weight61.7g /2.18 oz
Approximate Weight61.7g /2.18 oz
Dimension 45.90 x 31.20 x 10.70mm

Product Highlights

  • Brand: GE
  • 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

My GE cordless handset won't pair with the base after I swapped the battery — did I break something?

Some GE DECT handsets lose their pairing data when power is fully removed, including during a battery swap. This is a firmware behaviour, not damage. Re-register the handset using the base station's page or registration button — the process is in the handset manual under "Handset Registration." Once re-registered, the handset pairs normally and the issue does not recur.

The handset is fully charged but range feels shorter than before — what's happening?

DECT transmit power relies on stable voltage from the battery pack. When a Ni-MH pack is in its first few cycles, voltage can sag under the RF load of a live call, causing the transmitter to pull back power and reduce effective range. Run three to five full charge-discharge cycles to condition the cells. After conditioning, resting voltage should hold above 3.6V under transmit load and range returns to normal.

The handset is sitting in the base all night but the battery is nearly dead by morning — what's draining it?

This points to the handset not making a clean electrical connection with the base charging contacts, not a battery fault. The standby draw of a GE DECT handset is low enough that a properly seated, charged handset should hold charge overnight. Clean the charging contacts on both the handset and base with a dry cloth, reseat the handset firmly, and confirm the charge indicator light activates. If the indicator light does not appear within 30 seconds of seating, the contact alignment is the problem to fix first.

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