In a court document released during the settlement of a lawsuit between Apple and A123, we learn that Apple is in fact working hard to develop a large-scale battery division.
A123 lawyers presented the following information during the court proceedings.
“Upon information and belief, Apple is currently developing a large scale battery division to compete in the very same field as A123. In connection with that development, beginning in or around June of 2014, defendant Apple embarked on an aggressive campaign to poach employees of A123 and to otherwise raid A123’s business…
“…all of the Individual Defendants are working in a field of battery science, technology, and/or products that is substantially similar if not identical to the field they worked on in at A123.”
Apple settled the dispute with A123 without going to trial.
You'll find additional details on Apple's work in the battery biz at the link below.
Source: Business Insider