I like these two batteries that come with a wall charger. At first I thought I'd only charge one battery in the phone and leave the other as a spare, but soon found how fast and easy it was to open my Android and replace the battery - with OtterBox on it - this usually takes me less than 60 seconds from shutdown to restart. Be careful not to get dust/dirt under the clear part of the cover. Now I usually swap only when the one in the phone is nearly dead. Also, there's a glitch in using the original charger on the phone itself - sometimes it will fully charge the new battery and sometimes it hangs up and won't charge but halfway, and other times it will charge very little even after 8 or more hours. This seems to be a random and unpredictable thing, so use the wall charger that comes with these batteries to keep a second battery fully charged just in case.