The 510-T kit autos are different - they are 220mah, not 180 or 280mah, and they have their own new charging cable that does something weird and will fry both normal 510 batteries (manual or auto) AND Egos. It may just be a failure to communicate properly with the batteries and continue to charge them instead of stopping and showing the green LED.
When the 510-T auto kits were released, one vendor had a confusing warning in the description and said "only charge the 510-T on its own cable" though the actual problem is charging OTHER things on the 510-T's cable, not charging the 510-T auto on other 510 cables.
One vendor smartly removed that cable and replaced it with a normal 510 charging cable (which will charge 510-T autos too) but I can't remember which vendor I saw doing that. They stated in the description that it was normal 510 charging cable, not a 510-T cable.