Rechargeable 21700 batteries
With so many choices and specifications, battery shopping can be overwhelming. The simplest method is to look for something with a higher mAh number if you want a longer lasting cell, and a higher amp rating if you want a stronger cell. If you mostly vape at higher temps, focus on the amps, or power. If you vape at lower temps and want longer battery life, get a battery with a higher mAh rating. Finally, if you use a box mod with more than one battery, it’s best to buy batteries in sets that you keep together and charge together, treating them as one.
Most box mods only support 18650 batteries, but some support both 18650 and 21700 batteries. Check your user manual first to see which it's compatible with.
The Avatar AVB 21700 battery is a good budget option that pairs well with the Pico 21700 box mod. The packaging says it’s rated at 4000 mAh with a 30 amp continuous discharge rate, but independent testing came in at 3900 mAh at 20 amps. You can find better 21700 batteries out there, but they cost more, and the Avatar AVB 21700 represents a solid value. This battery is not compatible with box mods that only accept 18650 batteries.