The product was easy to work with because it had all necessary connectors already attached so no extra effort required by me as an engineer working at client site!The output voltage i have achieved while using same capacity cell which came without any warning! It's very impressive feature made my job simple just plug-n -play everything works fine even though there are few things like short circuit protection but nothing serious or harmful too much!! I am able make this power bank fit almost anywhere where AC supply failure may happen (like office)and still charge two different devices simultaneously one USB port charger & another laptop / cellphone charging device along side them both worked perfectly well. Very good performance overall!! We use many chargers/power banks across our campus including portable solar panel batteries etc.,but never found such powerful rechargeable li ion cells before till now only problem we faced during recharging process once sometimes battery start getting discharged itself due some fault internal mechanism within its self not MPINarada is a great company to deal with. They have a great customer service team and are willing to work with you on your projects. I would highly recommend them to anyone looking for a great company to work with. I would like to see them make more of a push to expand into the U.S. market. I am a big fan of their products and would highly recommend them. MPINarada has helped us with our data center power solutions. They have helped us build a power solution that is very cost effective and reliable.