Sharp MD-MT831 battery update!

Original Sharp AD-T51BT lithium battery: ~9 hours
Odd Chinese Sharp compatible lithium battery: ~17(!) hours

Though this says more of the age of the original battery than anything; I would expect a practically fresh one to go ~13 hours at least.

Notes:
* Original Sharp battery capacity is ~850mAh
* Odd Chinese Sharp battery capacity is apparently ~1000mAh
* Original Sharp battery year is circa 1998
* Odd Chinese Sharp battery was obtained in 2012; expected to be a year older