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This thread is based on assumptions that may not be valid. The number of charge/discharge cycles a lithium ion battery can tolerate is highly dependent on the maximum and minimum states of charge of each cycle, as well the rate of charge and discharge, which can be ignored here. A battery that is kept at a state of charge between 40% and 60% can go through thousands of charge/discharge cycles without degrading. A battery that is always charged to 100% capacity and discharged close to 0% may only last 500 cycles before it's capacity is reduced to less than 80%. I don't believe that any of us know what state of charge the management system in the Oasis is designed to maintain on the internal battery. Since it will be subject to a greater number of charge/discharge cycles, it would be logical to manage the state of charge of the internal battery differently than the one in the case. If Amazon has done that, there is no reason that the battery inside the device cannot last just as long as the battery in the case, or even longer.
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