I want to use the TPS62840 in my project with an input voltage of 6.2V and an output of 1.8v. The output voltage will be connected to an MCU and one temperature sensor. The peak current of my devices is around 24 mA(20mA + 4mA). The input voltage is supplied by four coin cell batteries(Part number: SR41W with a nominal capacity of 45mA and standard discharge current of 70uA) in series. Since the peak current far exceeds the rated drain current condition (~80 uA) for which the battery capacity is stated in the battery datasheet, how can I increase the battery's lifetime? should I put a current limiter before the voltage regulator? Regarding the peak current of my project, should I consider additional capacitors in my project? I would appreciate it if you help me to overcome this issue.
You can find the datasheet of the battery at the following link.