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Old 6th May 2008, 15:00   #1
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Question Li-Ion battery charging query


I have heard two contradictory opinions regarding the charging of Lithion Ion batteries. Some say that the battery should be charged only after it gets fully discharged, and once the charging starts, it should not be stopped till the battery is fully charged. They say that it is good for the health of the battery.

Others are of the opinion that the rule applied only for the older batteries. Its not applicable for LI-ion batteries. They do not get damaged even if the above conditoins are not followed.

Could the experts shed light on which view is correct and which is not?
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Old 6th May 2008, 16:19   #2
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Second opinion is correct, Li Ion batteries DONT have "charge memory" unlike old Nickel Metal hydrides and all. So you can charge whenever.

Though slow charging especially towards the end is the best to get max out of them, so most of us using fast/travel chargers which come along with sales package are not doing the best.

This site has got some good info: Charging lithium-ion batteries
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Old 6th May 2008, 17:07   #3
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Jaggu's right. Li-Ion's are best kept fully charged.

The older Ni-CD / Ni-MH batteries were the ones that kept track (so to speak) of the charge-cycles.
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Old 6th May 2008, 18:13   #4
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Agree here, there is no memory effect in Li-Ion, though the max charge levels are highest when you do slow charge.
Fast charging heats up the battery, So if you are buying 1/4th price chinese replacements you can have an exploding laptop.
Sometimes even with genuine batteries you get the exploding laptops due to lack of QC on part of battery makers.
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