Oh, sorry. I have made a mistake. Not axial play, but radial play of break disk. Axial was not so big, it was about 1 mm and i align it in two minutes.
I read a lot of posts and calc battery price. The most rational way is to set 8S2P 38120 Headway with Chargery Power BMS8. The price of the 16х38120 is bigger than the SLA but its not so expensive as LI-ion as i want to use earlier. Earlier i want to made a two packs with 5P7S 2600 mAh Samsung 18650 with original goped BMS that i get from original Li-Po battery pack.
But now is the main problem is where to get Chargery Power BMS8 when its discontinued
If you are interested in, i can post photo of original goped BMS. I was wonder that it has only 6 wires for 7 cells. But in fact there is a 7 resistors on balancer PCB. Its BMS and balancer can be extended up to 10S, it has the place for the electrical parts, but PCB covered with epoxy or something for that parts.