Battery Information

Battery Charging

Lithium-ion batteries have a high energy density and must be treated with care to ensure safe operation and a long lifespan. We recommend using the Blue Robotics H6 PRO Lithium Battery Charger to charge Blue Robotics batteries. It is preconfigured with the correct settings to charge all Blue Robotics batteries safely. If you are using a different charger, find the Blue Robotics battery you are using in the table below for the correct charging settings and a link to additional charging and safety information.

Improper charging and use of batteries can result in property damage or personal injury.

General Lithium-ion Battery Safety Guidelines

  • Always use a charger designed specifically for lithium-ion batteries with the appropriate voltage and cell count for your 4S or 6S batteries.
  • Always use the recommended charge settings shown below.
  • Use a charger with a balance mode or a dedicated balancer to ensure each cell in the pack is charged evenly. Cells that are not properly balanced may become overcharged. An overcharged cell is unstable and can lead to battery failure, property damage, or personal injury.
  • Do not exceed the maximum charge rate. Fast charging can increase wear and potentially cause safety issues.
  • Keep an eye on battery temperature while charging. If it gets unusually warm or hot, discontinue charging and inspect the battery for damage or issues.
  • Do not overcharge the battery. The charger should automatically stop when the battery reaches its full voltage, but double-check that it doesn’t exceed 4.2 V per cell.
  • Charge lithium-ion batteries in a safe area and do not leave them unattended during charging to prevent potential fire hazards.
  • For added safety, consider using a fireproof charging bag or box while charging batteries.
  • Avoid charging batteries in extremely hot or cold environments, and store and charge them away from flammable materials.
  • Inspect the battery for swelling, leaks, or other signs of damage before charging. Do not charge damaged batteries.

Blue Robotics Batteries

Lithium-ion Battery (14.8V, 18Ah)
SKUBR-100842
(BATTERY-LI-4S-18AH-RX-RP)
AppearanceCylindrical with black wrapping
LinkDetailed charging and safety information
Charge Settings:
Charge ProfileLiPoNumber of Cells4S
Nominal Voltage14.8 V total / 3.7 V per cellFully Charged Voltage16.8 V total / 4.2 V per cell
Recommended Charge Rate10 AMaximum Charge Rate20 A

Lithium-ion Battery (14.8V, 15.6Ah)
SKUBR-100839
(BATTERY-LI-4S-15.6AH-R1-RP)
AppearanceCylindrical with white wrapping
LinkDetailed charging and safety information
Charge Settings:
Charge ProfileLiPoNumber of Cells4S
Nominal Voltage14.8 V total / 3.7 V per cellFully Charged Voltage16.8 V total / 4.2 V per cell
Recommended Charge Rate 10 AMaximum Charge Rate 20 A

Lithium Polymer Battery (14.8V, 10Ah)
SKUBR-100346
(BATTERY-LP-4S-10AH-R1-RP)
AppearanceRectangular with black wrapping
LinkDetailed charging and safety information
Charge Settings:
Charge ProfileLiPoNumber of Cells4S
Nominal Voltage14.8 V total / 3.7 V per cellFully Charged Voltage16.8 V total / 4.2 V per cell
Recommended Charge Rate10 AMaximum Charge Rate15 A

Lithium-ion Battery (22.2V, 28Ah)
SKUBR-100313
(BATTERY-LI-6S-28AH-ADAPTED-R1-RP)
AppearanceCylindrical with blue wrapping
LinkDetailed charging and safety information
Charge Settings:
Charge ProfileLiPoNumber of Cells6S
Nominal Voltage22.2 V total / 3.7 V per cellFully Charged Voltage25.2 V total / 4.2 V per cell
Recommended Charge Rate16 AMaximum Charge Rate32 A

Storage

Before putting your batteries away for storage, use the “storage” function on your charger to put the batteries at the correct storage charge level. Lithium batteries must be stored at storage charge levels, typically around 40–60% of full charge, to prolong their lifespan and ensure safe, reliable performance. Storing them fully charged or deeply discharged can lead to capacity degradation or permanent damage over time. The Blue Robotics H6 PRO Lithium Battery Charger, and most other lithium battery chargers, have a “storage” function that will charge or discharge a battery to the proper storage charge level.

Once the batteries are at the appropriate charge level, follow these guidelines for storage:

  • Store lithium batteries in a cool, dry location at a temperature below 50°C (122°F), and ideally ranging between 15°C and 25°C (59°F and 77°F). Avoid locations with high heat or direct sunlight, as excessive temperatures can degrade battery capacity.
  • Ensure the storage environment is dry with low humidity. Excess moisture can lead to corrosion or internal damage, affecting the battery’s performance and lifespan.
  • Keep batteries away from flammable materials or potential ignition sources. Consider using a fireproof container or a designated storage area specifically designed for batteries to minimize fire hazards.

Batteries will self-discharge slowly while in storage. On average, they can lose about 0.5–5% of their charge per month while in storage, depending on various factors such as temperature, state of charge, age, and health. Periodically check your batteries every few months to ensure their charge does not fall below the minimum safe voltage, and top-up the charge as necessary.