Sigh. OK... More detail is apparently needed.
People use/make bottom feeder mods that force juice up through the hole in the bottom of the atty. OK. You can feed an atty from the bottom. OK. This is done because the alternative is to have a hose on the side of the atty. However, every effort is made to seal the connection.
People do fill cartos with the "condom method" from the bottom too. Similar to the bottom feeder. However, this is a fill operation and not done ever 2 drops.
Now,
you don't want to solve atty problems by unscrewing the atty, dripping 2 drops onto the bottom threads, and then wiping it clean, connecting it, then vaping 10 puffs. Then unscrew it, upside-down-drip 2 more drops, wipe, screw in, vape 10 puffs, repeat.....
1) Automatic batteries are not sealed and will fry when they get juice into them. Manual batteries are sealed.
2) Juice gunks up the threads too.
3) Juice at the atty connection is generally considered a problem, not a solution. Putting juice on an electrical connection is generally to be avoided, unless you are selling auto batteries and want to up your profits a bit
If your atty is dry and getting a burnt taste, you probably have a wicking problem or a gunked atty. The solution to either of these 2 problems is not dripping upside down/backwards.
Clean out the atty. Direct drip (from the TOP) 2 or 3 drops. Vape a bit. Drip 2 or 3 more drops. Vape. Working OK? Wicking issue. Direct dripping (FROM THE TOP) will work for that atty if the wick has failed and cannot be cleaned. Still not working? Gunked coil. Try cleaning again... research it... do a search.
EDIT: Oh, eGo-T atty. Fill from top and/or adjust wick. Still not a good idea to drip backwards/upside down.
2 cents