Formula E CEO Alejandro Agag wants the series to keep a standard battery across the field until 2025 at the earliest.
The original plan was to introduce battery competition within the first five seasons. Teams would have the opportunity to develop their own technology, as has been the case with powertrains since season two.
However, cost control means FE will continue with a single battery supplier in season five, with McLaren Applied Technologies providing batteries from next season until season eight.
At the moment, it may be possible for battery supply to be open in season eight (2021/22), but Agag wants to push that back.
“Batteries should not be open for the third cycle,” he told motorsport.com. “So I think if we ever open the battery – which we may – it would be season 11 onwards.
“The third cycle [season eight, nine, and 10] should be a standard battery. I think the manufacturers are all quite happy with cost control.
“They are not really stressed about making batteries, they want their own technology and they have it now.”
It’s understood other aspects of the car, including energy harvesting and brake-by-wire technology, could be opened up before then.