I have a battery powered Milwaukee but have had cordless in the past. Battery is more convenient but if the charge is low performance will suffer so factor in the cost of two batteries. If just using a few days a year around the house i would go with a corded saw.

Also for a few days a year there's no shame in using a hand saw. Get a miter box and a couple of saws and your good to go. An example of a simple project with hand tools. https://youtu.be/iBfUbQSmMrE