Meaning of numbers above Sense battery icon

[Flymat]

Does anyone know what the numbers at the top of the battery charging screen mean? Example 11/20

This will be just above where the % charge shows. Sometimes the number on the right increases. The 11 seems to be the same. 

Moderator Edit: Clarified subject

[SteveH · Accepted solution]

Mine currently has 11/22 and I'm assuming this is the date in MM/DD format

[Rich_Laue]

Mine also says 11/22 and the date is Nov 22

[Flymat]

Yes thank you.  I puzzled it for a week or so and then posted my question! Then a couple of hours later the answer came to my mind! LOL Often the mind seems to work that way.