Charles,

Brian put new Deka's in my bus back in Oct 05 and I had to replace them in July of this year with Lifelines, so the batteries didn't even make the 4 year point.

Based on Brian's usage and mine, I would NOT buy Deka's. Also, their customer service is not bus friendly, they didn't have a clue.

PS - Add a signature so we know what bus you have...