Need to replace some power tools after a break in in my garage. Want to go cordless and need a drill, circular saw, hedge trimmer and strimmer. Does any manufacturer do these tools with the same battery? Don’t want to end with 4 different batteries and chargers!!
Yes they all do.... Choose a platform and get a tool with charger and battery and then buy all the other tools "bare" with just the body. Your choice will be according to your budget and intended use, personally I use 18 volt Makita, and they have literally hundreds of tools that share the same battery. At the cheaper end of the scale Ryobi do a common battery/platform system which is perfectly good for most keen amateurs or even professionals on a tight budget.
You are really looking at two areas - Garden and Domestic/DIY. Whilst some companies do both you would be better choosing two brands, one for each area. Also, batteries for garden tools are much larger than handtools and you would not want a 48v 4Ah battery on a drill! For the garden tools - strimmer & hedge trimmer look at Mountfield and you can add in leaf blower, pole saw and more. The drill and circular saw - plenty of top line brands, find somewhere to try them out for feel. Some will be comfortable for you and others not.