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If connecting the new and old battery into the circuit, the old one will consume
the power till the two have equal voltage, which is changed into a resistance
actually. So mixed using batteries with high and low power causes energy
waste, even damages the device .
But in the real world, we usually mix batteries with diferrent power level
accidently, and it's difficult to recognize how much power a battery remains.
To aviod this waste, a new battery-coulometer is necessary.
The Digital Measuring paper shows a new way measuring the electric charge
promptly and conveniently by using soften OLED and transparant IC, which
Wang Gang Xiao Bin Cheng Yanyan