I like my kindle, but I have noticed that my newer one has less battery life. I am not saying it got old and had less battery life, I mean new it didn't have t

I like my kindle, but I have noticed that my newer one has less battery life. I am not saying it got old and had less battery life, I mean new it didn't have the longevity of the old one. I leave it sitting-- I thought off-- sometimes for a few days. The power goes down. Now I know why. I love ereaders, and I have always loved using a kindle. But I realize now (too late I guess) I should have been supporting an open standard rather than becoming part of another roach motel eco-system.