newtboy says... Lack of flexibility, perhaps, but exceeding your sales projections by so much you can't keep up and have to outsource from competitors could be a genius (or moronic if it backfires) marketing move....if Tesla power packs outperform ones purchased from competitors in an apples to apples comparison (but one designed to favor Tesla from the start because they are in Tesla cars, optimized for Tesla batteries), they end up selling exponentially more when the new factories catch up and make a surplus. Worth it if in 5 years competitors all start buying from him. wtfcaniuse said: Not being able to produce enough batteries for your own products would suggest issues in management, production and scope. Having to increase component supply from what are essentially competitors for several years in order to meet demand isn't really a good thing IMO.