which battery chemistry?

aljsk8

10 mW
Joined
Mar 3, 2008
Messages
31
heres a question for you all...

if all battery chemistries were the same cost and had the same weight/size/energy density

which would you chose and why...
 
Since the only thing you're leaving open is cycle life, I'm gonna say LiFePO4.
 
im leaving a lot open

physical durability
resistance to over / under charging
discharge charicteristics
shelf life
output over life
complexity (bms etc)
charging complexity
safety

heres the choices

sla
nicad
nimh
lipo
life(po4)
lico
li-ion

any others?
 
aljsk8 said:
heres a question for you all...

if all battery chemistries were the same cost and had the same weight/size/energy density

which would you chose and why...


LiFePO4 wins at everything, except:
-Size
-weight
-efficancy of recharge cycle

Lipo, Lithium Cobalt, is as little as 1/3 the size and weight of LiFePO4, and can be recharged at up to 95% efficancy. But they don't last as long, cost way more per watt hour cycle, and tend to explode. minor drawbacks.
 
Hey aljsk8,

I didn't see Li-Mn on your list. Doctor Bass and others are experimenting with Makita packs. Cells have very good energy/mass and energy/volume. Lower current (10C) than LiFePO but no balancing required.

-- Joey
 
Yar, LiMn needs to be on that list. Though, I'd put it second behind LiFePO4 - well, assuming e-molis vs a123s. Even within the same chemistry, there's a lot of variation in the quality of the cells from different manufacturers.

Also, "li-ion" is a general name that includes LiPo, LiCo, LiMn, LiFe, etc.
 
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