• Store at 40–80% charge if you're not using the device for a while. Full charge or empty puts stress on the battery.
• Keep it cool. Heat is the enemy of lithium-ion batteries. Don't leave devices in a hot car or near a radiator.
• Avoid freezing. Cold temps can temporarily reduce capacity. If a device feels sluggish in winter, let it warm to room temperature before use.
• Check for swelling. If a battery or device looks puffy, stop using it and dispose of it properly.