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Originally Posted by drdrewusaf
Quote:
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Originally Posted by xmind2006
However, most of these batteries will have some sort of "smarts" to them and may shut itself off at a current draw less than it's 1C rating, would depend on the application.
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If I'm reading this right, you're saying that the "1C, 15C, etc" rating is in proportion to 1? So 15C = 1/15 (or 1:15) of the battery's capacity? So if the phone isn't pulling the full 1.35mA the battery shuts off?
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Originally Posted by xmind2006
*And yes there are lithium polymer batteries that can safely discharge at rates of 15C or so, but they aren't too common, especially in the cellphone market (if at all or ever). The charge rating is still roughly at 1C though.
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And, if I'm reading this right, your meaning is the opposite (15C = 15/1 or 15:1)? So these "fabled"  batteries can discharge at 15 times the rate that they can charge?
Drew |
Whatever number is in front of the C rating is Multiplied by the lithium polymer's capacity. So a 15C battery means that it can discharge safely at 15 times it's rated capacity (example of a 15C battery:
http://www.all-battery.com/index.asp...OD&ProdID=1786 ) However, like I stated though, most of these batteries can not be safely charged greater than a 1C rating though.
The "smarts" I was refering to is a protection circit often built into a battery to protect the cells from over discharge (both current and voltage), over charge (voltage), and load balancing between cells if present. (
http://www.all-battery.com/index.asp...S&Category=178
If you don't know entirely what you are doing then always get a battery with this protection built in and it probably wouldn't hurt to get a LiPo charge bag if you are going to work with these "hobbyist" batteries. I'd recommend to also keep the charging away from easily flammable materials as improperly charged Lithium batteries can fail and burn at extremely high temperatures (1300+ degrees F).