over the past few months, i have been thinking to buy a replacement macbook battery or a second external hard drive. the one i don't buy now, i'll probably buy next summer. battery story: a few months ago, the battery started to go wacky, in where sometimes the battery would go dead with 30% charge left, and varying battery life (sometimes less than a hour), but i think i can stretch out the life of the battery for another few months, and i don't think i need to buy a new one this second as i don't use it too much away from outlets as of recently. i've seen batteries for about 100 bucks, but i'll likely cough up the 130 for the battery. hard drive story: i have an external hard drive already where i partitioned it to clone my hard drive and store my important files, but i read that it's not effective in cloning the drive in that matter, and i will probably need the external hard drive to solely be a cloning drive (i will keep using my current one to store important files for me and some others, and they look to be begging for a new storage spot). i will probably get those portable external hard drives with at least 250 gb of space (for when i eventually get a new internal hard drive), and don't want to go over 100 bucks for this. i also know black friday and christmas shopping specials are right around the corner, so i could snag a deal there. so i'm asking which one i should buy first: a replacement battery or the second external and your reasoning behind it. thanks.