They are not exactly meant for charging batteries, only to keep it charged. If it provides 0.5 amps on a good bright day then to get 95ah battery from 10-90% charge wold take over 150hrs if it was charging with 100% efficiency. My 3.8A mains charger takes 2.5 days to charge from 25% to 90%.
Edit
Just had a quick look at the AA one and it only provides up to 0.2A and up to 12.7V sit it will probably never get battery charged but should help to keep it charged.
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Currently 8less
2011 Q7 S Line 3.0TDI, 2016 Tesla Model S 90D
8 history:
2006 A8 Sport 4.2TDI quattro SOLD,
1997 S8, reached end of life with gearbox failure
Last edited by ainarssems; 16th March 2015 at 05:31 PM.
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