Hybrid System Warning Light

Hello,

I've begun having issues with my vehicle in the last two weeks. It started with a check engine light (code P1196) and has progressed to randomly showing the Hybrid System Warning light. When the light comes on (during start up) the car runs extremely rough and then shuts off. If you re-start the car it will still show the light but it can be driven in B. However, the battery charging indicator is pointing straight down as if the battery isn't charging at all, but the kw needle shows ready and running. Let it sit for 10-minutes and it restarts with no issues - the HSW light is gone and the car drives perfectly fine. It's done this randomly three or four times and then goes away. Possible battery issue maybe? I've never owned a hybrid before and have no idea where to look.