I have built a 3S 10P 15A Battery pack without BMS

[DarkZeus]

I wonder if a 3s 10p 15a battery pack without BMS is ok to use on my ebike or escoot for an additional 12v and using imax b6 balance charger instead of bms

 

[Smaug]

Nope.
What city do you live in? We want to keep an eye out for your fire in the news.