I got an Ego 1400 for Christmas.
https://egopowerplus.co.uk/products/chainsaws/cs1401e-35cm-chain-saw
I chose an Ego because of the 56v battery. I got the kit version that comes with the 2ah battery and costs around £250 for chainsaw, battery and charger. It charges up in about an hour or less (never really timed it) with the standard charger. I’ve never used any chainsaw before, but I used it a lot over Christmas and it’s great. Light, quiet, only on when you need it to be, little window for the oil (surprised how quickly it can go through oil) and a nice manual with it that gives you lots of tips and stuff on how to be a lumberjack.
I’ve chopped down old dead oak trees, loads of fallen stuff, etc. Fantastic bit of kit. Difficult to say how long the battery lasts, but I think the 4ah would have been perfect. Sometimes I’m still OK to carry on cutting and lumping logs about, but it runs out. Not a major bother, just pop back home for a bit of lunch and the battery is charged by the time you want to go back out.