Once the current reduces to approx ≤10 % of the chargers total output, it will then move to the float state. In this charge phase the charger will hold the maximum voltage for the chosen battery and charge the battery with reduced current as the batteries internal resistance can’t accept the charge current at maximum output.
This system allows fast charging without the risk of over-charging and is suitable for Li-ion and other battery types. The current then reduces as the battery becomes fully charged. The charger limits the amount of current to a pre-set level until the battery reaches a pre-set voltage level. Lithium chargers are based on a CV/CC (constant voltage/constant current) charge algorithm. LiFePO4 is a “clean” system and only takes what it can absorb. The so-called ‘miracle charger’ that promises to prolong battery life and gain extra capacity with pulses and other gimmicks simply does not exist. Whilst lead acid offers some flexibility in terms of voltage cut off, manufacturers of LiFePO4 cells are very strict on the correct setting because Li-ion cannot accept overcharge.
#Battery buddy to charge lithium full
The differences with Li-ion relate to the higher voltage per cell, tighter voltage tolerances and the absence of trickle or float charge at full charge. As you can see, we are playing with a very narrow window of voltage with lithium, less than 0.5V over 80% capacity.Ī Lithium LiFePO4 charger is a voltage-limiting device that has similarities to the lead acid system.
A lithium battery at 20% capacity will hold voltage around 13V, its lead acid cousin will be approx 11.8v at the same capacity. Its lead acid cousin will be approx 12.6-12.7v. Lithium batteries are not like lead acid and not all battery chargers are the same.Ī 12v lithium LiFePO4 battery fully charged to 100% will hold voltage around 13.3-13.4v. This is a question we get asked every day by the general public. Can I charge my lithium battery with a lead acid charger?
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