It is the capacity of the battery, measuring the amount of current that can be supplied for a number of hours.
For example, a 600 mAh battery can supply a current of 60 mA for 10 hours, or 40 mA for 15 hours, etc., before it needs recharging.
So if you get a battery with a higher mAh rating, it will last longer.
Yes, Radio Shack does carry replacement phone batteries. Here's an example listing: http://www.radioshack.com/pwr/product-reviews/Power-Batteries/Phone-radio-communication-power/Cordless-phone-power/RadioShack/p/2103196-3-6V-1200-mAh-Ni-MH-Cordless-Phone-Battery.html .
A cordless phone?
You can purchase a cordless phone battery at Best Buy, Amazon.com, ebay.com, www.batteries4less.com/contents/Static/cordless-phone-batteries.html, etc. There are many options.
Cordless
A cordless phone twin is set up by , plugging the base into the wall and the phone jack , one then can plug in the cordless phone twin into any outlet and ones phones will be set up.
Some popular US cordless phone systems include AT&T, Motorola, Panasonic and VTech. Others who make the cordless phone systems are Clarity and Uniden.
Target and Best Buy both sell cordless phone sets. You can also find cordless phone sets online on the Amazon website, as well as on the eBay website.
Because they walk while talking on the cordless phone and the wire comes in the middle.
You can add up to 5 handsets to this Verizon cordless phone system.
The Panasonic DECT 6.0 Digital 5-Handset Cordless Phone is great.
How do you wall mount the Telstra 12350 DECT 6.0 cordless phone please
One can buy a DECT cordless phone at various places. DECT is an acronym for Digitally Enhanced Cordless Telecommunications, which is a digital communications standard for creating cordless phone systems. These phone can be bought on websites like Best Buy or Walmart or Amazon.