Speed editor

I am interested in the speed editor, but a little put off by the non-user-replacable battery in it. I don't like to buy products that will effectively be garbage when the battery dies.
I've searched the Internet for information about the lifespan of a lithium ion battery that is only recharged every couple weeks, and found widely conflicting information. Can anybody speak to this? How long would you expect the typical service life of a speed editor to be?
Frank.
I've searched the Internet for information about the lifespan of a lithium ion battery that is only recharged every couple weeks, and found widely conflicting information. Can anybody speak to this? How long would you expect the typical service life of a speed editor to be?
Frank.