iPhone 4S will not stay switched off after new battery installed
crwdns2934249:0crwdne2934249:0:
Original battery not holding charge for more than a few hours from 100% charged.
New compatible battery installed by shop.
Charged to 100%, then iPhone 4S used as normal.
Switching off the phone using power button gets the following behaviour:
* it restarts after about 6-10 secs;
* repeated attempts to switch off gets same behaviour.