unfortunately not. but in the battery thread it has been discussed already.
it seems the companies that were asked would actually produce a replacement battery with larger capacity, but you have to order 1000 pieces minimum. while that would probably pose no problem to a dealer i highly doubt any one shop has already sold 1000 phones.
and for a private person i think its prohibitive because of the risk taken ( even if one battery will only be 4-5 USD, you need to make that investment upfront and you dont know how many people will buy one from you).
the safest bet is if PolarCell or Anker is going to make a replacement that fits, and from how it looks the size of the battery will prohibit anything much larger than 2000mAh.
probably the best way here is to get yourself a powerbank and carry that with you.
for me the small battery poses no real problem, this is also why i did not consider this as negative.
I ususally have a laptop with me during work hours where i can charge the phone off, and otherwise i have a small (2600mAh) emergency powerbank.
i do hope though that one of you guys is successful in that area, because more power is never wrong (dont know if you know Tim Taylor and "Home Improvement"
)