2S means 2 lithium-polymer cells wired in series, giving 7.4V nominal. More cells means higher voltage and more power.

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LiPo 2S
2S LiPo batteries (7.4V) for most 1/10 touring cars, buggies and short course trucks.
2S LiPo batteries run at 7.4V nominal (2 cells in series) and suit most 1/10 touring cars, buggies and short course trucks. More cells means more voltage, which means more speed and power, as long as your motor and ESC are rated for it.Check your car’s cell-count range before buying, then match capacity (mAh) and C-rating to how you drive. See all packs in batteries and chargers.
A 2S pack suits most 1/10 touring cars, buggies and short course trucks. Always check your car and ESC support this cell count before running it.
Only if your motor and ESC are rated for it. Too many cells can overheat or destroy electronics, so check the specs first.
Balance-charge a 2S pack on a LiPo charger set to the right cell count, on a safe surface. Store it at around 3.8V per cell in a cool place.
