Wont last

use batteries with lithium mine has lasted me over a year

you should try to change the type of battery in the setting to correspond with whatever type you are using.

Try alkaline batteries. I had the same problem.

I bought rechargable batteries for mine. works perfect now and lasts.

Use rechargeable batteries rated at 2300 ma/h or more. Forget carbon zinc (generic Eveready type battery) they wont even start my tiny Sony U20 and CR23 lithiums (2xAA) , not enough amperage and alkaline just dont last long period. I will suggest Energizer Lithium AA's, they do work pretty good. And make sure contacts are clean (use an eraser on a pencil if needed)