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parallel-serial notation
When discussing multi-battery banks it is common to describe the electrical layout with a particular notation.
p = parallel
s = series
Examples:
1p1s - a single battery
1p2s - two batteries in series, as one finds in the common 2x6v GC battery setup
2p1s - two batteries in parallel
2p2s - two sets of batteries in parallel linked in series as one finds in higher-capacity GC-based setups