Never over-tighten either atomiser or charger into the battery. Screw things in until they work, and then stop; never screw in until it is as tight as you can make it.
Always use the charger that matches the battery (don’t mix and match chargers and batteries from different brands or models)
Always use a recommend charger of no more than 1 amp.
Do not leave batteries charging unattended! (It’s always better to be safe than sorry.)
Never leave batteries in your car (especially with good weather being on the way, hopefully)
Keep dry. (Obvious, but important!)
Check that the contacts are free of e-liquid and clean with a cotton bud or tissue if needed.