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Have any battery questions?

Question: May I force discharge Lithium batteries?

When batteries are force-discharged with an external power source, the voltage drops to under O V (reverse electrode), and inner gas is generated. This can lead to swelling, heating, leakage, bursting or fire. 

Question: Can I use Lithium batteries with others together?

If different types of batteries are used together, or new batteries are used with old ones, the difference in characteristics of voltage, capacity, etc., may cause over-discharge of the battery which is exhausted first, leading to swelling, bursting or fire.

Question: What's difference between NiCd and NIMH batteries?

Both NiCad and NiMH batteries are rechargeable. The main difference between the two is the fact that NIMH batteries offer higher energy densities than NiCads. In other words, pound for pound, NIMH delivers approximately 30% more capacity than its NiCad counterpart. What this translates into is increased runtime from the battery with no additional bulk. NIMH also offers another major advantage: NiCad batteries tend to suffer from what is called a "memory effect". What this means is that when a NiCad battery is only partially discharged before charging, the battery "forgets" that it has the capacity to further discharge all the way down.
To illustrate: If you, on a regular basis, fully charge your battery and then use only 40% of its capacity before the next recharge, eventually the battery will become unaware of its extra 60% capacity which had remained unused. Your battery will remain functional, but only at 40% of its original capacity.
The way to avoid the dreaded "memory effect" is to fully cycle your NiCad battery at least once a month. In other words, fully discharge your battery and then fully charge it.

more info:cheap-laptop-batteries.com

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