My 2016 315 now runs with a new 3400 mAh battery. The Automower is now more quite.
The original battery was 2 years old and my mow times dropped from 70 to 62. I now average 75 minutes with a high of 93 on hot days. And the drive wheels' sound is noticeably less.
The non-Husky part number for this battery is
NOTE: If you change the battery, be sure to hand-tighten the torx bolts. The battery is in the upright position.