Self-powered eight-channel tester checks battery discharge rates

When a battery is inserted into any of the tester's channels, a timer is initialized for that channel. As long as any channel's input voltage is above 0.9 V, the timers for all channels will be updated in the Hyperterminal display every three seconds. When the channel's input voltage drops below the 0.9-V threshold, the timer for that channel will stop incrementing. Thus, once all of the batteries fall below the threshold, the timer values will stop displaying.