ASF2 force off

I have a laptop  precision m6700.. It runs on windowsos 10 .

The laptop automatically shuts down on its own suddenly only when the laptop is running on battery only..(not charging)

When it is on ac mode(charging mode ) there is no problem..

I went with all hardware tests and all drivers are up-to-date according to supportassist of Dell.

In the system Power  log events it shows ASF2 power off..what might be the problem here??

Is it due to the battery??ordue to any internal hardware issue or software issue??