I recently talked to Suki over at Bestvaping.net and they said that they plan on ordering more of the 3400 mah batteries but their last shipment of 500 sold out. The prices are going to be 8.54 USD each for unprotected flat top and 9.34 USD each for ones with a protection circuit. (Button top) She is not sure when they will have more in stock but she says she will tell me when they have more in stock and I will post it here.
Supposedly Panasonic is actually putting a protection circuit on these but this may just be a translation error.
Here a previous thread about them is. https://budgetlightforum.com/t/-/9812