Re chargers - just because something has the same threading do not mean it uses the same voltage, mah or even polarity charger. Some same-threaded models and even one grrrr 510 called FS510 are reverse polarity and will literally fry a 510 battery and vice versa so label your chargers. Also if you ever get a fat battery model, their charger are also not for slim ecigs. And LR (low resistance, under 2.5 ohm) atomizers and cartomizers are not for slim batteries. And 510-T chargers fry anything other than a 510-T.
Did you get manual batteries? 510 manuals are totally sealed metal on the threaded end and are extremely safe from ever being damaged or killed by a
juice leak and make it easier to get a good hit. Manuals also won't turn on accidentally from wind or vibration. if you have autos you have to be extra careful to not leak liquid on the end of the battery - if even a small amount gets into the open hole in the threaded end of the auto battery, it can gunk up or short out the drag switch, ruining the battery. So drip tips are not recommend on an auto battery's atomizer. And be especially careful with cartomizers (the most popular way to vape on 510 threaded devices or just about any ecig). The most popular cartomizer for slim 510 are Boge and slim 510 uses the standard resistance ones. These like thinner juices. I use 80PG/20Vg or less VG and I avoid juices that seem to drop a lot of flavoring sediment, clogging the carto.
PG - thin, lets through the most flavor, nicotine TH and nicotine irritation, makes thin visible vapor
VG - thick, dulls everything PG lets through, makes thicker visible vapor
normal atomizer - any PG/VG as long as it wicks at least as fast as you vape it (if not then you need to thin it)
stuffing cartomizer - thin juices, I find 20% VG or less won't degrade the drag and gives doo carot life
tanks and reservoir cartos - like the thickness of 20-30% VG but some thinner 50/50 juices may work