Kyocera QCP 6035 Reference Manual page 268

battery. Although you cannot control these factors, they are listed here to help you
understand why battery talk times and standby times may vary.
Replacing the battery
If you have to replace the battery in your Kyocera smartphone, be aware of the
following considerations.
If the battery becomes low in the course of normal use, an alert appears on the
screen describing the low battery condition. When you see the alert, perform a
HotSync operation to back up your data before you replace the battery. This
helps prevent accidental data loss.
If the Kyocera smartphone does not turn on when you press the Power/End key
on the keypad, recharge the battery immediately.
Before replacing the battery, turn the phone off. Never remove the battery while
the telephone features are active. To verify that the phone is turned off, open the
flip. The words "Phone is off" appear at the top of the screen.
Only remove the battery to replace it with another battery. Don't leave the
battery out of the Kyocera smartphone. For example, if your battery becomes
drained while you are traveling and you don't have a second battery or a cradle
to recharge it, it is better to leave the drained battery in the phone than to remove
it.
If the battery drains completely, the phone no longer operates. However, the
built-in backup battery stores your clock settings for about two days and your
data for about seven days. There is enough residual energy in the battery to store
the data, but not enough to turn on the phone.
In analog-only service areas, your phone uses much more
power (both on calls and in standby mode) than when it is
in a digital service area. It does not matter whether the
phone is roaming or in its home area
In CDMA digital mode, the farther you are from a base
station, the more power your phone uses.
Your phone uses more power during calls than when it is
in standby mode.
In CDMA digital mode, the more people there are using
the network, the more power your phone uses. At
high-traffic times (such as weekends) or in high-traffic
places (such as shopping malls), the phone must draw
more power from the battery than at other times.
In areas with no wireless phone service at all, your phone
uses more power as it searches for a signal. If it cannot
locate a signal after a set period of time, your Kyocera
smartphone goes into power-save mode.
As you travel, your phone switches to other service
providers. These other providers may have network
settings that are different from your home service
provider. Network settings can affect a phone's
performance in a given area.