A battery has a positive side.
218042
A battery lights up the light\nA woman lights up the night
622941
Its some thing to do.
100044
The conducting ink forms a resistor which does load the battery.  The thermochromic strip lies along the resistor and responds to the heat it generates.  The resistor is tapered, so its resistance per unit length increases as it gets narrower, and so does the temperature due to current flow.  The point along the strip where the temperature reaches the color-change value depends on the amount of current flowing in the resistor.  Thus the length of the changed color section indicates battery freshness.  This is a very approximate test.  A better tester loads the battery similarly, but measures the battery voltage under such loading.
234498
Something else in the pocket made contact with both terminals, causing the battery to pass current and generating heat.  I did this once by tossing a 9V that I thought was discharged into my pants pocket where I have my office keys.  The keys completed the circuit from the positive to the negative terminals, and I shortly noticed the heat.
98736
looks as though it's working
68587
attach a light bulb to a battery and have current pass through the different cups, the more current the brighter the light.
29027
It's a vote of confidence in the person supplying the information.
449396
I think you need a new battery.
599876
The answer is B, capable of carrying a charge.
418679
A step in the right direction.
81159
soon there will be small hydrogen fuel cells that will replace laptop batteries.
246565
An alternative energy source
292699
Its a contraception device.
323388
the battery is only used to keep the date and clock settings.  the only way keeping it plugged in and off could harm it is if there would be a power surge or lighting struck the house, which could fry it.
569177
The current rating on the battery is higher than the solar cell.  You need to add solar cells in parallel in order to boost you amp load.
91987
12.5 is fine. the battery is 12 volts.
174749
A photodiode will allow current to pass proportional the amount of light incident upon it.