Macworld Many of us are quite used to carrying around a handy power bank to top up our iPhone batteries during a long day away from a power socket, but these pocketable battery packs are usually not powerful enough to keep an unplugged and energy-hungry MacBook going all day. We’ve rounded up the best portable laptop power banks with battery capacities high enough to recharge a fading MacBook if you won’t be able to plug it into an electrical outlet for some time. Despite new laptops boasting improved battery life duration, it’s easy for your trusty MacBook to lose power after a day of intense…