A big tradeoff that a smart phone has is its battery life. Usually, a big disappointment to those who want to explore or use many features of the phone but are often restricted due to battery limitations. Realizing this as another opportunity to make instant money, many manufacturers have come with battery bank, an accessory, which can be used to charge your phone. Costing around $50 and above, these power banks are a convenient solution to always power needing portable gadgets of yours. However, you must know that once you buy a battery bank, you must charge it too so that you can charge your phone!! Also, they are usually bigger than the smart phone you own, adding another extra accessory to your limited travel luggage. As backup and power solutions, we do have a lot of solutions, getting inclined to just one of them simply does not make any sense. In a search to find simple, affordable, handy but powerful backup solutions, we explore a DIY AA battery pow...