11 of 11Image
Get an extra battery
The surest way to get through a busy day with a live phone is to get a spare battery if your phone has a replaceable battery. Keep it charged and throw it in your bag or briefcase when heading out for the day. Having two batteries will certainly get you through the longest day and maybe two days without charging.
A similar action is to get a case with a battery inside if that is an option for your phone. These increase the bulk and weight of the phone but can often double the battery life.