Having an extra battery for your emergency radio can be a good idea.
Rechargeable
Spare batteries for e.g. SANGEAN MMR88
Rechargeable.
When in an MMR88 it is charged via:
The sun and the solar panel that sits on the radio.
Or via the dynamo to which the crank arm is connected.
TYP ICR 18350
3.7 volts 850 mA
Game 21 grams
35 mm x 17 mm
Don't forget to recycle the battery that day in a green future.
Your Sangean MMR99 will survive many batteries, we dare to promise.