Almost every sat phone will have an average battery life of at least two hours. Some of them will even have a battery life that extends for eight hours. At both ends of the spectrum, people will be able to get those battery lives with just the talk time.
When people leave their phones on standby, they should be able to get even more out of the battery life of the phone. Some of these phones will be able to last for a full sixteen hours when they are used in this manner.
There are some satellite phones that will still have some battery power left after being left for nearly thirty hours on standby, making them even more valuable in a potentially difficult set of circumstances. People are usually not going to have to worry about the phones running out of power at the most inconvenient time, especially if they can plan quite carefully. These are phones that were designed to hold energy well.
A sat phone rental product will probably have a battery life that is just as long as a phone that people have purchased. Many of these devices will not have been heavily used.
Almost any features on any phone can start to degrade somewhat over time, but a phone’s battery can be surprisingly durable. People who are careful not to constantly leave their phones connected to chargers may be able to improve the batteries of their phones, or stop them from breaking down to the same extent.