Mobile phone batteries die quickly when the device is exposed to heat - including the scorching sunshine the UK is experiencing - but there are ways to prolong their lifespan.
Phones can swelter in this heatwave, during which temperatures have exceeded 25C in most places, because heat from the sun's rays can damage their internal circuits ands batteries.
Over time, continued heat exposure can even lead to data loss or screen damage, among other performance issues.
