I have a Lenovo IdeaPad Z50-70 and that battery is horrible like 2 hours if I'm lucky. I have tried maximising the battery life but it doesn't change much. I have looked on the Lenovo website for a larger battery but I can only find its regular 4 cell one. I have been looking for an external battery that I can just use to charge the laptop without the need of a power outlet. I have looked around but cant find too many and I really cant spend $200 on one. There are the external batteries which have USB outputs. Would these be able to charge my laptop? If not what are my options for charging my laptop on the go?