I bought a DeWalt in 2018 to use inside the barn for cutting out old beams with out having to run a gas saw.
DEWALT DCCS670X1 FLEXVOLT 60V MAX Lithium-Ion Brushless 16" Cordless Chainsaw Kit (3.0AH)
I have other DeWalt battery and older corded tools so went with DeWalt.
8 years with the saw and still runs like new.
Have been extremely satisfied with the power of it. The battery holds a charge really well under cold temperatures. It can be in the 20's for weeks and go out and just used the saw. Battery holds a charge.
Discovered after getting a sawmill that the battery saw is great for cutting 16-20' slabs in half to remove off the cant. First few cuts on the logs are always waste . No sense in starting a gas saw for 1 cut. Even take it as a backup saw sometimes since I'm usually within 20 minutes of the house.
Just bought my wife the Stihl GTA 26 to do her own trimming around the yard / tree line . She already has the battery trimmer that takes the same battery which lasts a long time. For a person in their 70's should be a good choice. Stihl had the Christmas special deal to get an extra battery included.