JavaScript Battery Guide
Battery Status API provides battery level, charging status, and remaining time for power-aware applications. The guide walks through Battery Properties. `navigator.getBattery().then(b=>{b.level,b.charging,b.chargingTime,b.dischargingTime})`. Events: onchargingchange, onlevelchange. Use: reduce animations when low battery, disable background sync, save state before power loss. The guide is organized into 1 sections that build on each other, each pairing a prose explanation with runnable code. Related guides: Arrays, Strings, Numbers, Math, Date. This is one of 145 JavaScript guides on JS Reference — see the full list on the guides page. Practice what you learn in the JavaScript playground, and look up any unfamiliar term in the JavaScript glossary.