iPhone batteries. iPad batteries. Laptop batteries.
Don't tolerate a worn out battery any longer. Get it replaced and stop running out of power all the time!
Lithium-Ion batteries in phones and other portable devices wear out more quickly when hot. At 20°C a Li-Ion battery will last for 2-3 years. At 30°C its lifespan drops by 20%, and at 40°C its lifespan drops by around 50% !
Replace it and keep using your device!