BATTERIES

摘要

2088765 9203852 PCTABS00011 Batteries give no visual indication of the amount of energy remaining in them after a period of use. Described herein is an arrangement which provides a visual indication of the charge drawn from a battery. The arrangement comprises an electrochemical device which is connected in series with the battery. The electrolyte in the device changes colour in accordance with the amount of charge drawn from the battery.