title_body: At what current should I charge a LiPo battery? I have several different LiPo batteries which I use with my drones, many of them are different voltages and different capacities. How do I know at what current I should charge my drone LiPo batteries?
upvoted_answer: Charging Lithium batteries is a far more delicate process than discharging them because of the complex chemical processes involved. Batteries that are rated for tens of "c"s of discharge rate are usually only rated for 1-2 "c"s of charging rate. Standard charging rates are 1c for regular speed and 2c for fast charging, with 2c damaging the battery more.
  
  C-ratings are an artificial marketing term that doesn't really help very much without being converted using this formula: Charging Current (amps) = C-rating * Battery Capacity (amp-hours) where one amp-hour (Ah) is equal to 1000 milli-amp-hours (mAh).
  
  So, for example:
  
  
  1500 mAh battery charging @ 1c = 1.5 A charging current
  2000 mAh battery charging @ 1c = 2.0 A charging current
  2000 mAh battery charging @ 2c = 4.0 A charging current
  2000 mAh battery charging @ 0.5c = 1.0 A charging current
  
  
  Charging at higher currents (higher c-ratings) is more damaging to the battery's cells and is more likely to cause complications like fires and explosions while charging. The opposite is true for charging at lower currents. It is hardly ever recommended to charge at more than 2c, and staying as close as possible to 1c is always recommended for safety and battery longevity.