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Summary of excerpts on using LiIons from Batteries in a Portable World: Plus the electrolyte is flammable and caustic, so it needs to be well packaged to make a spill unlikely, even if you do manage to overheat it.Īll this costs, which helps explain the price of the batteries.
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Trying to reset a LiIon protection circuit is dangerous to try yourself - you could end up with a nasty fire. Isidor Buchmann's Batteries in a Portable World site talks about methods some have used to try to reset the protection circuit on batteries that seem to have died young. The recent post about fixing iPod batteries likely had to do with re-setting something in the battery protection circuit that caused it to shut the battery off early. Problems with the power circuit can cause a "good" battery to shut down. There can be several functions for the protection circuit, including shutting it down in case of over charging, when the voltage drops to a predefined level, or if it thinks the battery is otherwise damaged. So LiIon battery packs have an internal circuit to prevent overcharging (which would cause them to overheat). Why are iBook and Powerbook batteries so expensive? Part of the reason is that LiIon batteries can do bad things if they overheat (creation of Lithum metal which "burns" in water, chance of fire). LiIon batteries go bad whether used or not, so only buy new LiIons. If the laptop does not need the battery it should be run to about 40% charge and stored in a cool place. First, they don't have a memory effect, and second, running them down tends to reduce their capacity. In particular, LiIons should not be run all the way down to prevent "memory effect". LiIons should be managed differently from the NiCad or NiMH batteries used in older laptops. Most laptops now use lithium ion (LiIon) batteries.