The life of your smartphone's batteries cannot be guaranteed to last for the entire day. Actually, they do however, the majority aren't fully up to snuff. It's sometimes not possible to charge the battery fully while you're running between meetings or even at the airport. If you've got the keychain charger you'll be able to get a portable battery boost whenever you require. https://ipsnews.net/business/2021/11/03/power-pod-charger-reviews-your-keychain-phone-charger/