Biggest capacity battery for Droid/Droid 2?

[thelemur]

I've had so much trouble with knock off batteries from ebay. I finally ordered an 1800mah OEM battery, but havent received it yet. I also ordered a 3600mah battery but it's total junk and lasts barely as long as a regular oem battery. Is there anything OEM that's larger than 1800?

Any suggestions? I don't care how big it is (physically) I just need the longest life possible when I am out on my motorcycle with no car charger.

Thanks!