its quite common for people to assume its the battery first time, i do it myself, and we all blame battery as they all die or run out of power at some point. but people seem to overrule that it could be fuel pumps or something, think of it, the fuel pump in the tank dosent have a super fine filter in it. and eventually gets clooged up with sh*t and dirt particles, also fuel can make its own gunk over time, and it will all work together and after a while the pumps can take no more and simply need replacing.