Request] ULTRA POWER SAVING MODE - like on Samsung - for when you're at like 5%, +500 miles away from a charger, and still need basic phone utilities. : r/jailbreak
Guide to Better HTC One M8 Battery Life: Everything You Need to Know
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Getting Rid of That Annoying Power Save Mode Icon on an Android Phone! - Instructables
How to extend your iPhone or Android's battery life | iPhone | The Guardian
HTC One Battery Drain and Overheating Problems- Dr.Fone