The answer is in my post from a week ago:
As of now, the majority of RIC product families are available with disposable batteries. The future trend is another matter. Besides, Phonak Lumity has outsize impact due to the brand’s popularity and the Roger tie-in. Their rechargeable battery life is marginal with the available technology, as can be seen from the complaints here, yet they saw fit to force their RIC customers into rechargeables now anyway. I’m sure I’m not the only one who’s eager to see their next flagship offering.