Keeps a Dell e6320 laptop from 2012 charged for 3-4 hours, but takes 4 hours or more to charge from 0 to 100%. Fan for AC output is a little loud, can be an issue for confined environments (like living in a car). Product doesn't list the type of lithium battery it is but the manual says 800 cycles which sounds the more dangerous and shorter lifespan Lithium Ion. If you have the time to charge it for many hours than it's probably fine, but for a daily use battery while homeless it might be problematic even with a protection plan and all.