901 attys will fit and work fine on an 808 batt, but I wouldn't drip on a gen-1 (V4L, V2, etc.) or older-style gen-2 (Volt, Bloog, G6, etc.) auto batt with the hole in the middle of the center connector post. I gather most/all gen-2 808 vendors now have the drip-resistant ("sealed") auto...