Common problems
Battery dies fast
Batteries wear out after a few years. Sometimes it's an app running in the background instead.
Signs
Phone dies by midday; laptop lasts under an hour; the battery percentage jumps around; the case is bulging.
Try this first
Check battery health (iPhone: Settings → Battery → Battery Health; Android: Settings → Battery). Check which apps use the most battery. If the case is swelling, stop charging it and bring it in.
What we do
We test the battery, replace it if it's worn, and check the charging circuit while we're in there.