13 RGU. I keep the bike hooked up on a battery tender whenever I'm not riding. Went to ride to work today, battery tender (Harley Model) was flashing green, meaning the battery is good to go. So I unhook the tender, turn the bike on...it cranks once and then rapid fire "clickclickclickclickclick". Figured maybe the outlet was bad (have a history of that with this garage), so I changed the outlet the tender was hooked into. Not 5 seconds after hooking it up, the light on the tender starts flashing green again, but this time the bike wouldn't even crank, just "clickclickclickclickclick". When I get home tonight I'll try another charger, see if maybe my tender has crapped the bed? It's a 3 y/o stock battery, though. Might be about that time for a swap?