Thank you for your question.
It is true that vehicles with larger battery capacity will tend to run on electric power over a longer range. However, even vehicles with a smaller battery capacity, whether the kilowatts per hour are 10, 14 or 15, can still run solely on electric power, at least initially.
The question is how many kilometres will these vehicles be able to run on electric power for, and that depends on the model. Once the battery is charged, it is effectively a zero-emission vehicle. Once the battery power fully runs out, though, the hybrid vehicle will run on gas power. How many greenhouse gases it emits will depend on how much long-range driving the vehicle is used for. That is the variable.