Battery Safety Information


Li-ion batteries are volatile and can be very dangerous if mishandled. Failure to read and follow the below instructions may result in fire, personal injury and damage to property if charged, stored or used improperly.

OpenROV Recommended Batteries

The OpenROV 2-Series uses six size 26650 Lithium-ion batteries (3 in each tube). OpenROV recommends the use of either of the following two types of battery. The charging requirements are different for each type. The batteries must be charged correctly to avoid damage.

General Safety

  • Charge, operate, and store the batteries between temperatures of 32 - 113 degree F (0 - 45 C).
  • If you suspect damage to the batteries, do not use them. If a cell has warped or is leaking disconnect immediately and move it to a safe place.
  • When batteries have reached the end of their life, dispose of them properly.


  • Always check that the charger voltage is set appropriately for the cell type.
    • Let the batteries cool down to ambient temperature before charging.
    • Always have a fire extinguisher nearby for emergency use.
    • Always charge batteries in an isolated area, away from other flammable materials. Examples of places not to charge include wooden benches and carpeted areas.
    • Use a charger specifically made for Lithium-ion batteries.
  • Never charge batteries unattended.
  • If at any time you witness a battery starting to balloon, swell up, smoke or become hot, discontinue charging process immediately, disconnect the battery and observe it in a safe place for approximately 15 minutes. This may cause the battery to leak, and the reaction with air may cause the chemicals to ignite, resulting in fire. 


  • Never drain your batteries below the low threshold.
    • For the white LiFePO4 cells do not go below a cockpit voltage reading of 6 V.
    • For the blue Li-NiMnCo cells do not go below a cockpit voltage reading of 8.25 V.

Storage and Transport

  • Store batteries between 40 and 80 degrees F (4 and 26 C) for best performance and longest life.
  • Do not expose battery pack to direct sunlight (heat) for extended periods.
  • When transporting or temporarily storing in a vehicle, make sure not to exceed the temperature range listed above.


  • Use caution to avoid a puncture of the cell. Puncture of cells may cause a fire.
  • Never drop the batteries.
  • Make sure to keep the batteries dry.

Flying on an Airplane

  • Lithium-ion batteries must be carried in carry-on baggage only.
  • When a carry-on bag is checked at the gate or at plane side, all spare lithium batteries must be removed from the bag and kept with the passenger in the aircraft cabin.
  • The battery terminals must be protected from short circuit. Examples include taping each end or using a box with dividers for each cell.
  • If you have any questions, check with your airline.


If you have any questions, please contact us: