For the past 10 or so years I have been using the Dewalt 18 volt cordless tools. They treated me well, but now the batteries are all shot except for 2 and I need more than 2 to do the awesomeness that I do. I have been told that the 18v tools are not even close to aas good as the current tools available now.

What do you guys suggest to replace them. I need opinions from people who really use the tools and have lots of experience with them.

if you use them professionally Milwaukee 18v fuel

huge line up of tools , good stuff with good features they keep taking top in torque and speed of charging

Milwaukee

I have the Dewalt 18v tools and still have like 3 chargers and 6 to 8 batteries that are still good. I would keep them and by some more batteries, used or i think you can buy new aftermarket batteries for them online. If you decide to buy new equipment, I'm looking for a 18v Dewalt Sawzall.

Milwaukee M18 platform using generic batteries from Amazon or eBay.
Also M12 platform for smaller tools. Generic batteries also.
Both platforms have tremendous tools.

Keep batteries in room temperatures and they will work 2-3 times longer. I keep all batteries in one tool bag. Easy to carry in each day after work. They go in the storage room - heated and air conditioned.

I've been pleased with my Dewalt 20 volt cordless.

Milwaukee.
My Sons are carpenters, my Brother is a carpenter, I'm a handyman. Sons and Brother have always had Dewalt and are now moving to Milwaukee slowly. Brother likes Milwaukee....especially the double mitre/double bevel laser saw. My Dewalts are doing just fine but if I ever get a new mitre saw it will be a Milwaukee.

Milwaukee all the way I use mine every day.

Ryobi for me

Spend 30-40 bucks on amazon and get a pair of knock off batteries. All ive been using for the last 4 years for some ryobi 18 volts and they last fine. Bought a pair for my old porter cable cordless set and they work fine as well for a few years now. Reviews are good on most of them. Name brand tool batteries cost as much or more than the tools-insane.

Milwaukee

When my Dewalt 18 volt tools batteries died I replaced with dewalt 20volt tools and they have worked great. I also bought an adapter to run my 18 volt tools with the 20 volt batteries so I did'nt throw out my 18 volt tools .

There is an idea.

The Milwaukee M18 compound miter saw is fantastic!
The portable work stand they make looks lousy.
I bought the Bosch stand which is super. No problem using it.

Above I mentioned keeping the batteries in room temperature. I meant don’t let them stay in a truck to freeze in the winter and roast in the summer. The lifespan is much longer.

low cost solution

two replacement batteries is 33$ on amazon now

I have all 18v too. I plan to replace with Milwaukee over time though

The M18 cordless drills don't last too long in my limited experience. The M18 weedeater is pretty good quality so far. The batteries are pretty decent. I would recommend Ingersoll Rand for impact guns. Not cheap, but hopefully they won't burn out like Milwaukee.

I have dozens of DeWalt 20 V and they’re used every single day all day long and never had an issue in fact I’ve had Dewalt for since they came out with cordless and never once had an issue

I'm a professional contractor. I've been using the Milwaukee M18 platform since it came out about fifteen years ago. I have no complaints.

It's hard to beat the M18 Fuel Lineup... I'm not a tradesman but switched from Dewalt to MKE and it was a quantum leap in improvement
Here's some Power Tool Porn:

I use them daily, I have 18v dewalt, boss has 20v dewalt, the make an adapter so you can use 20v batteries on your 18v tools, Milwaukee makes good tools, so does makita. I spend as much time with my makita circular saw as I do my wife, I love her.