It means you should use a battery with seven cells in series (of that given chemistry that is talked about, in this case lithium ion cells) and the number of cells in parallel is yet to be decided on available space, current draw and so on. If someone says 'Use a 7S battery' then there is no yP since this is not relevant in this case.

That is why they are usually called 12V, 24V and 48V batteries instead of 6S, 12S or 18S. Also, lead acid batteries are the reference when talking about 12V/24V/48V systems. But that is not very common since the 1P part has no meaning in this case. Technically these batteries can be called 3S1P, 4S1P and 6S1P. Lithium batteries for small/medium RC vehicles are usually 3S or 4S, again no cells in parallel. There are no cells in parallel, so it is just 6S. A lead acid cell has a nominal voltage of 2V, 6 * 2V is 12V. This is 4 cells in parallel, or a 4p, 1s4pĬar batteries are usually 6S lead acid batteries for a total voltage of 12V. This is 4 cells in series, or a 4s, or 4s1p Note, these are not case sensitive and are usually written in lower case. If Xs or Yp is missing then it is either to be read as 1s or 1p respectively or it isn't important for what is meant to be said.

XsYp means X cells in series (to get the desired voltage) and Y cells in parallel (to get the desired capacity). This is the notation for the configuration of the battery. What does S and P stand for? What is Xs, Yp or XsYp with X and Y being numeric digits?

What does s stand for