Dying batterys

Hi all , i've been using my bike for a week now and the batterys seem to have less performance each day , i'm charging them when i get home each evening , last night i let them charge thro the night but it made no difference , i've also tried a spare charger . Would it make any difference if i charged the batterys seperately .
The bike is about 2 months old but i bought it off ebay and there's no warranty , i have found a date stamp on the seat tube , stamped 2006 so i'm wondering if the batterys have been sat around for a year or more and are now U/S .

Thanks Wizard
 

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