I use ,, a hand pruner on one year/ two year canes
'a loping shears on wood up to 1.5 inch
a 21 inch brush saw on anything up to 4 inch thick
a chain saw on big things like hickory fire wood
'There are small battery chain saws which are OK and safer than starting a gas if you are in a tree, hand tools work since grapes are small, it justify it by cutting 4 inch 8 inch trees
'The skill saw I have has small teeth and never gets used on pruning, however if the main use is cutting metal/ wood yes it could also cut grapes but slower than a brush saw with large teeth
'I love and hate lithium batteries. They are fantastic for weed eating around the 50 grapes or a couple hundred feet of fence line. ,,,, I have yet to find one that lasts two years and judging by the constant used battery tools at Habitat Restore a lot of others also love/ hate lithium batteries. ( If one cell goes the whole battery pack needs to be fixed,,, not a lot of folks feel competent to pull a battery pack apart).
If you get one you want the highest voltage battery since that reflects how many hours (,, if it trims the whole fence line on one charge) or you want several replacement batteries (my son with Roybi tools mows his lawn using 4 to 6 freshly charged batteries) (and has also tossed his first Roybi mower)