noun
battery-powered calculator
A calculator that runs on batteries, as opposed to solar or plug-in types. Often used in technical or product descriptions.
この電池式計算器は単三電池で動きます。
This battery-powered calculator runs on AA batteries.
電卓 is the common everyday word for 'calculator', while 電池式計算器 is a more specific technical term emphasizing battery power.
Compound of 電池 (battery) + 式 (type/style) + 計算器 (calculator).