To mow 1.5 acres in a single charge you'll need a lithium pack for sure. As it is I have a 1 acre lot and I have to mow in multiple charges, and to be kind/easy on the batteries which are lead acid. I love the mower but it certainly hasn't been the most economical machine.
EcoRider - riding lawn mower electric conversion - EcoRenovator
Tim Fulton's Simplicity Broadmoor 728
