Looking for opinions and adviseon my upgrades

[Cal000]

I was in the market for an ebike for a while. I came across a used 36v 500w 13ah 20in fat tire folder for $500. I wasnt sure I liked the bike but it was a deal that was to good to turned down. I figured it would be a good intro to ebikes and if I didnt like it I could easily sell it.
So far I have upgraded to 48v 15ah battery(was fairly new got it from a guy that wrecked his bike for $175) upgrade to 20amp controller and lcd8 color display I also switched to a thumb throttle changed to bmx handle bars and a much more comfy seat.

For my next round of upgrades I want to add a suspension (fork and seat post) and upgrade the brakes. Im gonna get the satori anamaris seatpost and a air fork from aliexpress.
For the brakes i want to go hydraulic but the cost of hydraulic e brakes was more than I want to spend at $180 for the pair. I'm considering going plain hydraulic. I found self contained hydraulic calipers that will allow me to use my existing brake lines I think I'm going to to go with those and increase to rotor size to 203 in the front and 180 in the back.

Futher down the line I want to change out the motor to a 750w or 1000w to get more torque hoping for an increase in speed. I'm able to get up to 24mph but I dont feel like I have good torque. I f i could do 26/27mph with good torque I'd be happy. For this motor I'm considering a 750w one piece alloy wheel or a 1000w normal motor on a spoke wheel neither option is a name brand motor(very open to suggestions here).

Before I got my current battery I was going to make my own. I came across these flat 40ah cells https://a.aliexpress.com/tKG0JZVI
I only have room 10 so I would be going back to 36v. Im hoping to offset the lower volts with higher amps. If anybody knows of a 36v 1000w controller let me know. I think it will be much easier to put the battery pack together than if I used 18650 they have tabs so I could just solder them together with out worrying about damaging the cell. I'm also thinking it would be much easier to locate and replace a bad cell.
Any tips advice or opinions are welcome.

I want my bike to be an agressive city bike

 

[tomjasz]

Wow! What luck. A 48v (54.6v) battery didn’t fry your controller! Or overheat the motor! 36v(42v)

Check out Micah Tolls battery book on Amazon. You seem to be going off track with battery choices and understanding.

See vruzend battery kits. Soldering 18650 cells is not recommended. Check out ebikeschool videos.

 

[Cal000]

I'm familiar with the ebikeschool and micah's videos and I know from research that the heat from soldering was bad for the cells that's why I was looking for alternatives to 18650 and found those cells they have tabs that extend from the battery so the heat from the soldering wont effect the cell.
A few bad cells will ruin a battery pack so I'm figuring since it would only take 10 cells to make a 36v 40ah battery it would be much easier to build the pack and if I had a problem it would be easy to isolate and replace a bad cell as opposed to a pack that contains alot more cells. If I used 100 cells I would still be well below the watt hours of the pack I'm proposing. I dont have space for a pack that size and it would be beyond my battery building capabilities, alot more points of failure and maintenence would be much more difficult.
Do you think the cells I linked are not a good selection for my purpose?

 

[tomjasz]

I’d want to know more about who made the cells. What do they weigh?

 

[Cal000]

I'm not sure but someone pointed out that lipo's are a potential fire hazard so I'm gonna go in a different direction
I still want to make my own
I've been looking into spot welders I just need to do some research on them to figure out what are the important features and spec
I just dont want to waste my money on a junk battery pack that has low quality cells or bad build quality

 

[indianajo]

I'm not sure but someone pointed out that lipo's are a potential fire hazard so I'm gonna go in a different direction
I still want to make my own
I've been looking into spot welders I just need to do some research on them to figure out what are the important features and spec
I just dont want to waste my money on a junk battery pack that has low quality cells or bad build quality

Living in Brooklyn, I doubt that you have the cinder block building with concrete floor and steel roof, a steel welding table, and NO WOOD to "safely" weld up LIIon cells. You burn your apartment down with some diy project, you're in debt to the owner & the neighbors for the rest of your life, plus 40% for their lawyers. You'd have to become homeless, living out of a shopping bag, to get away from them.
I bought 2 piles of garbage with "samsung" cells, one from Amazon, one from ebay. Buy from luna or ebikeling, since you are a US resident. They actually work. Or for more money, an actual bike manufacturer with dealers.

 

[Cal000]

I ended up going with a jueshui 1000w geared hub motor from Ali express performance is about the same though gonna try to run more amps and volts thru it and see the difference. If its still not feeling like I want it to gonna throw a mid drive in there

 

[JES2020]

I'm sure you know amps= torque and volts = speed.