Complex sentence: An A23 battery is cylindrical, smaller than even an AAA battery, measuring only 28.9 mm long and 10.3 mm in diameter, with a typical weight of 8 grams; however, this battery must not be confused with a similar single-cell N battery.
Split into simpler sentences: An A23 battery is cylindrical, smaller than an AAA battery, measuring 28.9 mm long and 10.3 mm in diameter, with a typical weight of 8 grams. This battery must not be confused with a similar single-cell N battery.