True or False: You can determine the number of cells in a battery by dividing the total voltage by the volts per cell.

True or False: You can determine the number of cells in a battery by dividing the total voltage by the volts per cell.

• A. False
• B. True
• C. Not enough information
• D. Depends on battery type

Answer: (B)

Dividing the total voltage by the volts per cell works because a battery pack in series sums each cell’s voltage. If you know the chemistry, you know the nominal voltage of one cell, so total voltage = number of cells in series × volts per cell, and you can rearrange to number of cells = total voltage ÷ volts per cell. This gives an exact count for a simple single-series pack; for example, a 12 V alkaline pack uses about eight cells in series (8 × 1.5 V). With Li‑ion, a 14.8 V pack comes from four cells in series (4 × ~3.7 V). The only caveat is that if the pack has parallel strings, the voltage stays the same as one string, so the division reveals the number of cells in one series string, not the total cell count. Nevertheless, the basic relationship is valid when you know the chemistry and the configuration.

Dividing the total voltage by the volts per cell works because a battery pack in series sums each cell’s voltage. If you know the chemistry, you know the nominal voltage of one cell, so total voltage = number of cells in series × volts per cell, and you can rearrange to number of cells = total voltage ÷ volts per cell. This gives an exact count for a simple single-series pack; for example, a 12 V alkaline pack uses about eight cells in series (8 × 1.5 V). With Li‑ion, a 14.8 V pack comes from four cells in series (4 × ~3.7 V). The only caveat is that if the pack has parallel strings, the voltage stays the same as one string, so the division reveals the number of cells in one series string, not the total cell count. Nevertheless, the basic relationship is valid when you know the chemistry and the configuration.