To mining on your mobile phone, you need to charge the battery several times in a day. Because ofthis reason, the battery life will be death several times. Because modern smartphones can not replace the batteries, the phone needs to be discarded at a much earlier time than the estimated service life.

your reason is too shallow to believe in , the reason is the specification of a mobile phone cannot be fitted to do mining even you got the most high specs in mobile phones , your reason is just a secondary factor why mobile phone should not be used in mining .
Regarding the battery life - can't you just keep it charging and leave it at home for the rest of the day? My only concern is the electricity costs and if the profit will cover that or be worth it.