About Battery Recharging

FirstCall 4G Mobile Alarm Pendants are supplied with either an easy and convenient magnetic cradle, or a magnetic charging clip. This makes it very easy to connect the charger so there can be no mistake.

When the battery drops to 20% charge remaining a text message is sent to the first Contact.

The battery charge time is about one hour, but we suggest leaving it connected overnight.

Battery Run-Time

How long the battery will last depends on many factors including how often the pendant is used and how it is set-up.

In our experience the battery life will be about three days in the standard configuration, be we recommend charging the pendant every night, just to be sure.

The relationship between GPS fix times and pendant battery recharging

GPS receivers take a lot of battery power, and because a personal pendant needs to be small and lightweight the battery also needs to be small and light. If the time required between position fixes is short the battery will need to be recharged more often. Conversely, if the pendant is put into a deep-sleep mode, where it only wakes-up and takes a satellite fix when needed, the battery can be recharged less often.

The manufacturer specifies the operating time between battery charges can be as long as 415 hours (17 days), but this can only be achieved under very specific conditions when the pendant and the GPS receiver is in a very deep-sleep mode most of the time, and the battery is new. In this setting the pendant will take a some time to activate and acquire a GPS fix.

The pendant can also be programmed to send its location to a smartphone app or a computer on a very regular basis, (often called leaving a breadcrumb trail). This is used for tracking fast moving objects, such as vehicle tracking, or for security applications, but naturally it also uses a lot of battery power.

We normally supply the pendant set for an expected battery run-time of at least 3 days, which we believe is a good trade-off between GPS position accuracy and battery recharging.