LiFePO4 Batteries - Anyone tried them yet?

[inside]

Seems the prices are coming down. I found these EV Works Pty Ltd (http://www.evworks.com.au/index.php?product=BAT-LP12V90AH)
Obviously Chinese built but I was thinking two of these gives you 180AH of which 70% is usable. For my usage this would last 4-5 days and they should fit into the standard battery space under the front passenger seat in the 110. Anyone using LiFePO4 yet or have any opinions?
Winston Battery Limited (http://en.winston-battery.com/index.php/products/power-battery/item/wb-lp12v90ah?category_id=176)

[chazza]

Your link to EV Works, has an interesting page on caring for LiFe batteries; it could get quite expensive having a battery-management-system as well; however; a 10 year life is appealing.

Do the mathematics on the cost of converting, as opposed to replacing lead-acid batteries in 10 years; for me it is still cheaper to stick with lead-acid,

Cheers Charlie

[PhilipA]

Usually the multi cell batteries have their own BMS included.
Single cells linked can have a BMS incorporated into the cell link .
AFAIK the BMS is necessary to ensure equal charguing of each cell, as some cells can be more efficient than others in a linked set.
There is an OZ site that discusses all this in detail, but it is more oriented towards non auto applications.
Regards Philip A