haha yeah thats what happen to me too, it just shuts off but after putting battery back in i was suddenly at 80%, so charged it to full then did it again and after turning back on it was at 90% so did another full charge and now my battery is working just how it used to
so all this time it wasn't the rom i broke but my battery.. well i did break the rom lol but was because of my battery.. sooo now that i know my battery is fixed im gonna put the rom back together how it was but with all the latest goodies lol and hopefully it works