The stock device often shuts down at 30% erroneously. The patched manual provides the "Battery Reset" sequence:
Is the blog's audience or experienced radio techs ? weierwei vev3288s manual patched
High/Low selectable (typically 4W/5W VHF, 4W UHF). Battery: Li-Ion battery pack. Essential Operating Shortcuts The stock device often shuts down at 30% erroneously