Each external battery provides an extra 3,500mAh, ... 15, and 16 series, and the company plans to expand with Samsung Galaxy S series cases by the end of 2025.

You can buy an external battery for your smartphone pretty much anywhere, ... — 2.8x Asus Chromebook Flip — 2.5x iPad Air 2 — 2.9x Samsung Galaxy S7 — 7x LG G5 — 7.4x iPhone 6 — 11.5x ...