Crudos,
With the additional use as a battery charger you are taking a piece of gear that is useful and making it super useful, now your light can power your GPS, Radio and lord only know what else because AA batteries are in EVERYTHING.
Typical solar chargers will be able to charge their own battery twice in the same day. Here in NM during the summer you can stretch that out to 3 or 4 cycles a day so you're looking at one of those $3 walkway lights charging 2 AA batteries a day in the winter and 3-4 in the summer. Not bad for $3 and they come with a battery!