New 20 ounce tumblers available now! Forum donation credit with purchase. https://www.wildguzzi.com/Products/products.htm#Tumbler
It's too late but, I've been upgrading to these...http://www.euromotoelectrics.com/product-p/edl-voltrect.htmEliminates the regulator and diode board, works great and less connections to corrode.
Note: Not Compatible with lithium iron batteries as supplied by Shorai or dry cell batterys as supplied by Odyssey.