The GP-4L is indeed a rebadged Kaito radio. Checkout
this new solar powered pocket radio from Kaito:
http://www.kaitousa.com/dp936.htmThe Kaito DP936 was $5.95 yesterday on Amazon.
BTW, Amazon may drop the Eton/Grundig radios
from their website due to the very high return
rate.
I now carry a Sangean DT-200VX as my EDC radio and
will upgrade to the DT-400W on Monday. I feel in
an urban area like Mesa, AZ, a reliable AM/FM pocket
radio will do just fine. Here it is difficult to
pick up shortwave stations, as opposed to living
on the east coast.
You should get 38 to 42 hours on the Sangean DT-400W
depending on volume level and whether you listen to
AM or FM bands.