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John - 1) As stated above, if you only read 12 volts on the battery after charging, it didn't get charged properly. 2) 1.3AH isn't going to last long on a Climax. My Climax has a 4AH battery pack, and it runs for about 4 hours. So, I would estimate the current draw is near 1 amp. 3) The two 6V batteries: I assume you charge them independently at 6V? If you are trying to charge them while connected in series using a 12V charger, one battery may be getting more charge than the other.
 

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I stand corrected. Although a typical charging voltage for a 12V lead acid battery is 13.8v, the open circuit (no load) voltage of a fully charged battery should be 12.65 volts. According to this site ... http://www.batteryuniversity.com/partone-13.htm
 
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