DroidStang
Member
good reading
Li-ion does not need to be fully charged, as is the case with lead acid, nor is it desirable to do so. In fact, it is better not to fully charge, because high voltages stresses the battery. Choosing a lower voltage threshold, or eliminating the saturation charge altogether, prolongs battery life but this reduces the runtime. Since the consumer market promotes maximum runtime, these chargers go for maximum capacity rather than extended service life.
Simple Guidelines for Charging Lithium-based Batteries
Li-ion does not need to be fully charged, as is the case with lead acid, nor is it desirable to do so. In fact, it is better not to fully charge, because high voltages stresses the battery. Choosing a lower voltage threshold, or eliminating the saturation charge altogether, prolongs battery life but this reduces the runtime. Since the consumer market promotes maximum runtime, these chargers go for maximum capacity rather than extended service life.
Simple Guidelines for Charging Lithium-based Batteries
- A portable device should be turned off while charging. This allows the battery to reach the threshold voltage unhindered and reflects the correct saturation current responsible to terminate the charge. A parasitic load confuses the charger.
- Charge at a moderate temperature. Do not charge below freezing.
- Lithium-ion does not need to be fully charged; a partial charge is better.
- Chargers use different methods for “ready” indication. The light signal may not always indicate a full charge.
- Discontinue using charger and/or battery if the battery gets excessively warm.
- Before prolonged storage, apply some charge to bring the pack to about half charge.
- Over-discharged batteries can be “boosted” to life again. Discard pack if the voltage does not rise to a normal level within a minute while on boost.