To update it appears the update caused the battery to be capped at 2800 mAh when the battery capacity is 2900 mAh - hence the 3.4% wear
This was solved when the battery was completely drained and I did a full charge. Phone is able to charge to 2900 mAh
Tried to google but no mention of this bug....
Same, previously will 0% wear and now mine also show 3% wear level and cap at 2800mAh while it suppose to be 2900mAh. Either the battery life app got bug or Apple update 10.3.3 to further protect the battery and I don't think we will see 10.3.4 or even 10.4 when iOS 11 is coming in 6/7 weeks time.
This week we will likely see DP5 and PB4 as it's the two week cycle, when Apple reduce to one week update cycle, I perosnally think PB6 will be the last beta before official release in mid-sept.