Recharge cycles can vary and they usually are limited depending of the type of battery. Thus it is important for any user to be aware of the capacity of the battery as it degrades over time due to several factors both internal and external.
There are many batteries invented and used over the time for portable devices. In early ages, the batteries used were so fragile and hard to use because of their opened parts and the high liquid discharge form their bodies.
No matter how much you hear that lithium-ion batteries are completely safe, there have been cases when the consumers have experienced issues with them.