M50

I want to pick up a new pair of batteries (LP-E12) for my Canon M50 Mark II, but I was also a bit sceptical of the ones I saw. I noticed that the official Canon ones (which only carry about 875mAh of capacity) cost upwards of $60 when on Amazon I can find higher capacity ones (linked down below)...

So i want to take a power cable for the HDD , because i bought and SSD and i don't have any more power cables for the HDD now that the one the HDD was in i plug into the SSD and i want to buy this http://imgur.com/flSWWeF and i don't know where that white thing goes , i have some cables...

I have the following pc: Intel Pentium G2010 2.80GHz 4GB 1333MHz ddr3 ram Zotac Nvidia Geforce 210 1GB DDR3 Gigabyte H61M S1 mobo will a r7 240 1gb ddr5/gt 730 1gb ddr5 be able to play latest games at 720p @ low/medium settings...........if they will then which one is better??? Also i have a...