hobie live well help

[TJones]

one of batterys went dead for hobie live well. picked one up at frys for about 10 bucks less. 7 amp instead of 8 amp. i cut the connector off old battery and put it on new battery. when i charged it up with the standard hobie charger it i charged up very fast. to fast. why is this ? will this battery have a decent output time? the battery was sitting on metal shelf at frys which would decharge the battery given enough time? correct? which would mean the battery would be, or should be completly dead. in that situation the battery should take more the 5 hours to juice up . but it took only 3 or less. again it was a 6 volt 7amp . as oposed to 6 volt 8 amp. one amp should not make much differece, correct? is this gonna work for a reasonable amount of time. my other option is get heavy duty battery from hobie. i saw one on the kevins yak. does anyone know where to get one? it would come with a new live well cover to accomadate extra width. any advice would be appreciated. thanks.