Check Your Batteries Day
Check Your Batteries Day is held on March 10. This event in the first decade of the month March is annual. 
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Just like any other device, batteries need to be tested to determine if they are airworthy. That is, to determine if they will perform properly when required under normal conditions and more so when needed in emergency situations.
How Does a Battery Tester Work? Battery testers work by applying load and monitoring the voltage and current of the battery. The actual process is quite simple – when the conductive elements of the tester touch both the positive and negative contacts on the battery, the current is released and can be measured. Typically, it's recommended that the battery be inspected at least twice per year.
Power down the device to avoid additional battery use.
Similar holidays and events, festivals and interesting facts
Barbie Day on March 9 (Barbie debuted on March 9, 1959 at the American International Toy Fair in New York);
False Teeth Day on March 9
Get Over It Day on March 9
International Bagpipe Day on March 10
National Mario Day on March 10 (United States);
The International Day of Awesomeness on March 10
Pack Your Lunch Day on March 10
International Mario Brothers Day on March 10
World Plumber’s Day on March 11 (initiated by the World Plumbing Council);
Fill Our Staplers Day on March 11
Worship of Tools Day on March 11