The answer to your solution is solar and portable battery chargers. A solar one can charge your smart phone with the help of direct sunlight. It will last for several months to come. It is really helpful if you want to go out on a trip for a few days. You need not take any back up then. There are many companies that sell such charging products like wireless and multi usb charger. The usb multi charger can charge multiple devices simultaneously like 10 smart phones at a time or 5 tablets at a time.
There are several points that should be taken into the consideration while buying the portable battery charger. Let us have a look at some of the most important ones. Here we go...
One of the most important things to check is the amperage. The higher the amperage, greater are the chances to damage your device. So, choose the one that has low amperage according to the requirement specification of your mobile phone.
Check if it can be connected in your car, so that you can use the same one anywhere; at home, office as well as in your cars.
Make sure that the vendor from whom you are buying is a reputed company and has got license to sell such products.
Make sure the company or the store gives you the warranty, after sales services and sells at the cheapest possible rates.
I hope that the above mentioned points help you to select the best portable battery charger from the best store that sells quality products.
If you are looking for such a company, before checking out anywhere else, do visit http://www.mobilesolarchargers.co.uk/