Run-time is tricky

The Family Handyman - - BY JEFF GORTON -

Run-time, which is how long a tool can run be­fore the bat­tery dies, is al­most im­pos­si­ble to de­ter­mine un­der real-world con­di­tions. It de­pends on how hard the saw is work­ing. That said, there are two bat­tery rat­ings that can help: amp-hours and watt-hours. Ba­si­cally, they tell you how much power a bat­tery can store. We give the watt-hour rat­ings on p. 52. We used bat­ter­ies with the high­est rat­ings avail­able. They’re larger, heav­ier and more ex­pen­sive than other bat­ter­ies that fit the same tool.


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