I need a replacement headset for a RCA 25110RE3-A phone. How can I purchase just the headset?

Look up "Battery Bob" on the internet, then call him. Great customer support and if there is one out there, he will have it. Generally free shipping too.

replace the headset

I fund it for $14.99 at www.budgetbatteries.com

Local radio shack does not have it. Available by web-only .... www.radioshack.com is the place to go.

Dantona® 3.7V/500mAh Li-ion Cordless Phone Battery for RCA

You pay
$17.99
Model: BATT-2682
Catalog #: 55029968

You can get them at www.budgetbatteries.com they are $14.99 Guaranteed to meet or exceed original with a 1 year warranty.

Disconnect the all lines and power
Remove battery of the headset
Put battery back in
Connect phone line
Connect power cord

I have the SAME EXACT issue. Weird.

Mine was doing the same and I just pressed the "find" button on the wall plug in thing- and the headset started working....you may want to try that.....?????

I, too, have this model phone and love it. The headset battery barely lasted 9 months. I've been bumped around to many places including Thompson, Radio Shack, etc. I do believe Thompson (800-338-0376) has the battery for the HANDset, but they DO NOT have the battery for the headset. The HEADset battery is available through partstore.com (on the internet) (866-925-7278). This shipping document gives you the pricing info:

RCA BATTERY/ LI-POL 52707 $20.99 1 $20.99 Sub Total: $20.99 Shipping/Handling: $7.95 Tax: $1.26 GRAND TOTAL: $30.20

You may well find that the HANDset battery is available there, also. The RCA HANDset battery part number is 5-2683. You will need this to cross reference if you use partstore.com.
Warning: Radio Shack will say that they have the replacement battery. I had to send the one they ordered for me back to Radio Shack - - don't need to say more!!!

Hope this helps.
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I guess one of the two phones may have opened the locked-extension phone function!