Hi Bryan B.,
Precision M6500 was offered with 9-cell 90Whr Primary Battery. This battery can give you a good battery backup as it will last for one hour at a stretch if your computer is consuming 90 Watts of power.
For business users we have a yet to be released system model, “Latitude E6540” with 4th gen Intel Core i7-4800MQ Processor. Currently there are no models in Precision with 4th gen Intel Core i7 Processor.