I'm putting together a gaming rig with an i5 11600k (liquid cooled) and GIGABYTE Z590 mobo... average RAM, GIGABYTE AORUS NVMe Gen4 SSD, beefy PSU... everything is coming along nicely... with the end goal being to be playing on 1440p with in-game settings pretty high.

But now i need to choose my GPU. I have access to a 3060 Ti or a 3070 Ti for the same price (friendly scalper). I've read that the 3070 will likely cause a CPU bottleneck while the 3060 will be the opposite. I'm pretty new go all this, so I'm not sure I fully understand the issues involved with bottlenecking... or maybe I'm making it more complicated than it needs to be. Is the main problem that the component being bottlenecked will not be able to use 100% of its "power"... meaning that you're maybe not getting your money's worth out of of that component?

If that's the case, then I'm thinking I should definitely go with the 3070 Ti since it is costing me the same as the 3060 and will provide some future-proofing or perhaps get me a better resale price (if i ever choose to go that way). Does that sound about right or am I missing something that would actually make the 3060 Ti the better choice (with better performance) in my situation?
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> If I opt for Additional 2.5" 2 TB 5400RPM SATA Hard Drive, the battery 4 cells 64Whr battery should be selected.
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This is probably because the larger battery takes up the space where a 2.5" HDD can be installed.

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> Does Using both SSD & SATA Hard drive impacts Laptop Performance?
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There is no surprise here, things that run on the SSD run at the SSD speed. Things that run on the HDD run at HDD speed. But since there's more stuff using power in the laptop the battery will be drained quicker. HDDs can conserve power by going to sleep if you make sure they're not being used in the background. If the HDD motor is running often, it will consume a little extra power and shorten the battery life.

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> Can someone shed some light on choosing up the hard drives & battery?
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It depends which matters more to you:

1. Is battery life the most important thing? -- Then get the 6 cell battery.  

You can always plug in a USB hard drive and get extra storage space that way.
2. Is tons of storage space without having to carry an external HDD important? -- Get the SATA HDD and "normal" battery. (4 cell batteries are typical)
It doesnt affect performance, as long as nothing is on the hard drive. If you actively use the hard drive, the app that uses the hard drive slows down to hard drive speed. For some tasks (like rendering a video), you can write to the hard drive without performance issues because the bottleneck is somewhere else (cpu)