External and high capacity batteries are becoming popular these days. Users with heavy usage either carry a spare battery, if their handset comes with a removable one, while other prefer to use cases with external battery or a battery pack that can help them charge their devices. If you’re looking for a powerful and durable external battery pack, take a look at NewTrent’s PowerPack Ultra. This beastie comes with a massive 14,000 mAh battery, which is more than enough to charge a smartphone up to six times. The battery pack has dual USB ports, with one carrying 2.1A while the other one comes with 1A, which can be used to charge smartphones. NewTrent guarantees that PowerPack Ultra can survive 500 charge cycles, which is pretty amazing. The battery pack is water-resistant and requires almost 12 hours for a full charge. PowerPack Ultra comes with a $69.95 price tag and can be purchased from the product page link below.