I got the battery case yesterday and charged it overnight. Started with 100% on both the case and phone this morning. It’s been providing charge fine all day but the % keeps jumping around. It’ll go down then up a little then down. Put it on the charger for a minute today and checked the %. Went from 39%-44% in legit a minute. Then after my shower was up at 51%. Used it a bit and it went down to 44%. Wondering if it just has to take a few charges and settle in or if it’s defective