DeWalt Tools, Replacement Battery question?

Turns out that i didn't tell you guys the truth, when i posted the ad.
Forgot that i am starting out with two lithium-ion batteries.
I have one on the vacuum cleaner, that's in the closet, and not on any of the shelving in the garage.
Well, anyway, I'm happy to be getting a third battery, for all the tools, that i have, along with the plug in regular electric ones.

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Last year Tractor Supply had a 2-for deal on the 6ah flex-volt, bought them to back up the chainsaw 9ah, and the (2)10ah (non flex-volt) in the push mower. When it comes to Li, I only go with the mfr's stuff, not worth the small savings to risk burning down My Home. MAC Tools is the DeWalt hi-output stuff, if You come across any of their stuff.