As far as I can tell from a quick glance (WhatsApp Web is blocked at work unfortunately), the battery level is transmitted once at page load. So, a constant indicator might not work well. Might take a further look later.
As far as I can tell from a quick glance (WhatsApp Web is blocked at work unfortunately), the battery level is transmitted once at page load. So, a constant indicator might not work well. Might take a further look later.