i have this formula.
months warranty divided by cost = months of service per peso of cost. the bigger the figure, the more advantageous to the customer. the assumption being, anything beyond the warranty period is a bonus.
if one wants to input that beyond-warranty performance, one has to make his own experimentation.
but there is a caveat. when doing the experiment, one may tend to unconsciously change his "battery habits", rendering the experiment, tainted.
ah well...





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