GreatCall Jitterbug5 User Manual page 23

IMPORTANT!
The Jitterbug Rechargeable Battery must be fully charged before using the phone
for the first time. We recommend an initial charge of up to 12 hours. Failure to do so
may damage your battery. If you use your Jitterbug without charging the battery, and
it is critically low, it will turn itself off.
14 Getting Started