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12V Rechargeable Lithium-Ion batteries
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Old 30th September 2009, 02:18 PM   #21
Havoc08 is offline Havoc08  Denmark
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I'm powering several ta2024 and 2020s of a 7aH lead battery and it easily plays for +36 hours at normal listening level.
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Old 30th September 2009, 02:50 PM   #22
Saturnus is offline Saturnus  Denmark
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Originally Posted by r0b View Post
Ok, thats still like double the price. I guess maybe one could find them a little cheaper someplace else. I mean the 18650 Trustfire 2 cell deal for $6,75 (unprotected) is a killer deal too. I guess they are fine for my small portable project.
I'll consider the LFP for my next project, where size/weight is less high on the priority list.
They also have at least 4 times the cycle life. When LiPo's starts to die after around 500 or so cycles the LFP's will have higher energy density and still last at least 1500 cycles. So in fact they are effectively half the price.

As far as I know the only difference is 0.4V lower charging voltage per cell for LFP's than LiPo's , so a normal power diode per 2 cells could be put in series with the charger output but I'm not certain that the charger will function correctly then. It will depend on the design.

Last edited by Saturnus; 30th September 2009 at 02:52 PM.
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