Before IPhone6s change freely batteries, effective still now?

Absolutely and OK, my just changed battery last month, the dot is maintained to change in accredit. I am just appeared on the market 15 years 6s when the first batch of bought mobile phones, two years many do not have time to change all the time. Will two this years draw out the mobile phone outside until winter temperature is low close automatically machine. Just changed batteries to do not have a few days had not checked outside at present. Wanting 6s only is to just appeared on the market the batch that those a few months buy, can change, nonexistent whether to go out protect. You can go whether is the mobile phone batch that government-owned net looks up you with serial number changing freely inside batteries plan limits.