in order to avoid the impact of the normal wear quartz watch, many quartz watches are equipped with a battery voltage warning function, is stopped by the second hand for 4 seconds, and then quickly jump 4 down Said that once this phenomenon occurs, the quartz watch can walk about 10 days or so, to remind you to immediately replace the battery. This function is also called "E.O.L", but there is no center second hand quartz watch, there is no such function.
In fact, as with all the batteries, the new battery capacity is not exactly the same, the battery capacity of the unit is expressed in milliampere hours (maH). So far, has not heard of a kind of instrument, you can quickly, lossless and accurate detection of silver oxide battery capacity, as early as 20 years ago, I heard that foreign countries have been rewarded with heavy money to the equipment Invention, but now still no one can give it out.
Battery manufacturers to do the battery factory quality inspection, are still used as a batch of battery discharge experiments, is to test the battery connected to a load, the formation of a certain current closed loop, until the battery voltage down to a certain value, Discharge current multiplied by the discharge time is the actual capacity of the battery. When the experiment is over, the battery will be scrapped.
Now the rapid detection of quartz battery method are heavy-duty discharge, see the battery in a different discharge current, the pressure drop, because with the use of the battery internal resistance (also known as battery resistance) will increase; So that once the discharge current increases, the closed-circuit voltage will suddenly decline.
Like some Swiss-made quartz calibration instrument, are attached to the battery heavy-duty discharge test function, the load resistance of 2000 ohms, 50 ohms and 5 ohms several files (see photo). In fact the watch with silver oxide batteries also have different uses, such as high current output type and low current output type, their electrolyte is different, the former is usually used for light alarm LCD quartz watch, the latter for the pointer Type quartz watch.
When the button is pressed, the load resistance is turned on, immediately observe the extent of battery voltage drop, different batteries should have different indicators, but generally can not be less than 1.35V voltage.
The size of the cross-sectional area of the battery, the test temperature and test results are related to the larger battery, the ambient temperature is relatively high, the voltage drop less.
Battery heavy load experiments, only about the estimated capacity of the battery, but can not reach the precise measurement of the value, and this experiment can not do a long time, because it is more consumption of battery power.