Sentina Quest is the most reliable rechargeable smartphone battery that holds its charge for a full year. Using an internal patented featured called 'SmartJack', it seals power for over a year while other products can only hold it for up to three months of inactivity. Sentina holds 97% of its charge if left on the shelf for a year. The 2400mAh lithium-ion charges an iPhone or Android in under three hours and it can charge it 1.5 times before requiring to recharge itself. Its small and light design with only 3.5 oz of weight also incorporates a flashlight of 160 Lumens and a super bright 8-LED lantern. Recharges via USB/AC adapter in six hours. It comes precharged and ready to use out of the box. Available in multiple colors and styles.