That's better, and balances perfectly when you only have two batteries paralleled. But with more than two the ones in the middle still loaf a tad.
Yes, I used to think it would balance them all. But I had it pointed out to me that it doesn't - and worked the math to confirm it. It's a lot better than feeding the end battery, or even the center one. But the batteries in the middle still see a somewhat bigger resistive voltage drop than the ones on the end, because they're seeing high current-produced voltage drop in both of their hookups. To balance perfectly you'd need the jumper cabling to get progressively fatter as you get closer to the battery with the fed terminal.
Best is to connect each battery separately to a common + and a common - binding post, using + and - cables for each battery that TOTAL to the same length as those for each of the others. This is equivalent to the tuned-thickness jumpers but a lot easier to fabricate. (For convenience the common binding posts can be one battery post each on the two end batteries.)