What is the expected life of a battery in terms of charging cycle?

You can expect approximately a 20% loss of capacity after 200 full cycles - which would equate to about a year's worth of being used every business day. This would be common across Li-ION batteries in today's mobile computers (laptops, tablets). The battery should last several years, but expect to have some capacity drop over time. Keeping the battery cool during the summer months can greatly increase the lifecycle of any battery.