Despite what a number of people may tell you Lithium Polymer (LiPo) batteries are not fundamentally unsafe, but they need to be treated with more care than NiCd or NiMH. If abused sufficiently LiPo cells can catch fire and this fire can be difficult to extinguish. The following precautions should help you enjoy using LiPo batteries without having a major incident.
‚ The minimum safe discharge voltage is 2.5V per cell when under load, or 3.0V per cell when not on load.
‚ When more than 2 cells in series are used, a controller with an adjustable cut-out should be used and it should be set at or above 2.5V/cell.
‚ Only charge LiPo batteries on a charger specifically design for LiPo batteries.
‚ Always ensure you use the correct charging voltage for the cell count.
‚ The maximum charge rate should be 1C, e.g. 0.7A for a 700 mAh cell. For best charging, low charge rates should be used where possible.
‚ Check the charge voltage (or cell count) and current a second time.
‚ Never leave charging LiPo batteries unattended (at any charge rate).
‚ It is best to charge LiPo cells in an open space on a non-flammable surface (such as a brick or quarry tile) and away from flammable materials.
‚ For long term storage it is recommended that cells are fully charged and then discharged to between 50% and 60% of their capacity.
‚ Use connectors that can not be short circuited, or use silicon fuel tube to protect exposed connections.
‚ Have a dry powder fire extinguisher or a bucket of dry sand within reach.
‚ If a pack is involved in a crash or is otherwise damaged:
‚ Remove the pack from the model.
‚ Inspect the pack for damage to the wiring or connections.
‚ If necessary, disassemble the pack and dispose of any damaged cells.
‚ Disposal of LiPo batteries:
‚ Put the pack in a safe open area and connect a moderate resistance across the cell terminals until the cell is completely discharged.
‚ CAUTION: The pack may get extremely hot during the discharge.
‚ Puncture the plastic envelope and immerse in salt water for several hours.
• DO NOT store at temperatures above 113F (45C)
• DO NOT charge at temperatures above 113F (45C)
• DO NOT expose to temperatures above 140F (60C) at any time
• DO NOT disassemble, crush, puncture or incinerate
• DO NOT short external contacts or reverse charge
• DO NOT immerse in water (more info to follow, re last item in the above list)
• DO NOT drop or strike
• DO NOT place in microwave oven, standard oven or pressure container
• Discharge to approximately 50% of capacity before long term storage
• Store in cool, dry area free from dust and corrosive gases
• Dispose of at authorized battery disposal sites only