I had a DeWalt cordless, I sold it as the base plate cracked. It twisted so badly it became inaccurate and I attempted to straighten it not expecting any success. At the same time my drill developed a fault and the chuck needed replacing. I have since got rid of my DeWalt gear and switched to Milwaukee - I know you pay the premium, but there is a noticeable difference in quality. I haven't a cordless jigsaw now but I would seriously think about Milwaukee Fuel - SGS and Powertoolworld are worth checking out (I've bought from both), their prices are sometimes better than Screwfix.
If you have a lot of work to do there's something to said for having for having three or four smaller batteries rather than two huge ones, because of their lighter weight.