Ok so i have two laptops, one has One slot with ddr3 4gb ram and is way too slow for school, the other one is 5years old but fast as hell but has a dead battery. Should i buy a 8gb bank or a new battery. Providing the price is roughly the same.. ??

Maybe whichever costs less, but you need to consider some other factors as well, like processor

@Aitkotw the old one is a hp pavilion dv7 with an intel i7 and the new one is an AMD8 I guess

@resdac new battery

@Aitkotw why so? Just curious

@resdac as you said your old laptop is super fast, I suppose it's because it has core i7. Your new laptop is not working so good because you think you don't have enough RAM. You can increase your laptop speed sightly with additional RAM but it won't run twice as fast. If you really want to compare these things, Google both laptop's your processor model number and compare them.