Hi,
I got a contract for a large pergola and decided to get a cordless rotary hammer drill for the project (~$400 to $500). I ordered it a month in advance along with all the other stuff needed for the project. Once I was on the job site I realized that I needed a different battery for this tool than I needed for my other Hitachi / Metabo tools. I had to run to Lowes to get a corded rotary hammer drill ($200). Thankfully, CPO has a good return policy and I won't lose any money.
Long story short... if you are a Hitachi person be aware of the differences before you buy something that you can't use.
There are two websites: metabo.com and metabo-hpt.com. Both are completely different companies with different tools and batteries.
Cheers,