Just clarification
Parallel ( "|" = a wire ) 0=empty space (editing reasons)
+ [12v] - 10ah
|000000|
+ [12v] - 10ah
|000000|
|000000|
|=00000|
+ [12v] - 20ah total
Series
+[12v] - 10ah
|00000|_______________ ( Negative "-" Cable)
|
-[12v] + 10 ah
000000|_______________ (Positive "+" Cable)
Above equals 24v (volts) at 10ah (amp hours)
Hope this helps clear things up a little
NEVER WHEN RUNNING IN SERIES CONNECT BOTH CABLES TO BOTH BATTERIES YOU SHOULD ALWAYS HAVE 1 CABLE CONNECTING THE 2 BATTERIES +TO - AND ON EACH BATTERY THE ONE THAT IS NOT LINKED TO THE OTHER BATTERY SHOULD BE FREE I.E LEFT BATT IS LINKED TO OTHER BATTERY ON THE POSITIVE SIDE THIS MEANS THE NEGATIVE TERMINAL OF THIS BATTERY SHOULD BE "FREE" OR ON YOUR 24V LOAD AS THE NEGATIVE INPUT AND THE RIGHT SIDE WOULD BE THE OPPOSITE Should you screw this part up you will find out very soon Please be careful around boxes filled with explosive gasses, acid, lead and all things deadly!