In modern life, smartphones tend to have a declining battery life over time, which is where power banks come to the rescue. Anker’s leading 5K model for iPhones has dropped to its lowest price ever at just $18, down from $26. This portable power bank offers 12W fast charging and provides an additional 20 hours of smartphone use without adding much bulk to the iPhone. While it is highly regarded, its main downside is that it uses a Lightning connector, making it incompatible with newer iPhones and iPads with USB-C ports. However, for those with older model iPhones, this power bank is a great option. It comes with Anker’s ActiveShield safety system and is suitable for iPhones, iPads, and some retro iPods. Overall, it folds up compactly for easy storage in pockets or bags, making it a convenient solution for those times when your smartphone battery is running low. Follow @EngadgetDeals on Twitter and subscribe to the Engadget Deals newsletter for the latest tech deals and buying advice.