Originally Posted by Dwight Ennis
Lithium-ion batteries begin to degrade from the day they are manufactured. It's just the nature of their battery chemistry. In addition, they lose around 20% of their capacity after 1000 charge cycles. We've all had to replace a cell phone battery, or a laptop battery after using it a while. Nature of the beast.
Agreed, I notice after a few years now, the running time is significantly shorter, estimating about 30% shorter than when the battery was new.