Hi Jeff, I'm sorry for the late reply.
First of all, thanks for your support!
You raise up a very good question. The answer to your question: yes. You can not replace the PowerHouse easily and ANKER's PowerHouse is lighter.
If the PowerHouse's batteries go bad, you can look for our support. I'm 100% sure that we're very happy to help you to solve any problems.
Thank you again. Your support are mean a lot to us.