Less Expensive Lithium Starting Battery
01-09-2015, 06:07 PM
#1
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Less Expensive Lithium Starting Battery
I was looking into the Porsche lithium replacement battery:
http://press.porsche.com/news/release.php?id=510
The specifications are said to be 18 AH with a weight of 13 pounds. By the way, this is actually equivalent to a 60AH lead acid for a number of reasons (see link above as well).
Anyway, it's well known that retailers mark up the price of lithium batteries enormously, even though they all come from the same factories in China. In this case, auto batteries use the same chemistry as cordless power tools, Lithium Iron Phosphate.
So I looked around to figure out what the real cost of the LiFePO4 cells Porsche is using is. Here are some comparisons that have similar discharge current:
1. RC airplane batteries: $220
2. Motocycle LiFePO4 battery: $400
In particular, two of the Deltran BTL35A480C batteries should be equivalent to the Porsche battery in terms of amps and capacity. That comes to a cost of about 2x$200 = $400. Weight is also only 8 pounds.
http://www.batterytender.com/Batteri...t-Battery.html
Has anybody tried putting in parallel a couple of motocycle batteries like this to build an equivalent battery to the $1700 Porsche unit? Theoretically, it should meet or exceed the performance.
http://press.porsche.com/news/release.php?id=510
The specifications are said to be 18 AH with a weight of 13 pounds. By the way, this is actually equivalent to a 60AH lead acid for a number of reasons (see link above as well).
Anyway, it's well known that retailers mark up the price of lithium batteries enormously, even though they all come from the same factories in China. In this case, auto batteries use the same chemistry as cordless power tools, Lithium Iron Phosphate.
So I looked around to figure out what the real cost of the LiFePO4 cells Porsche is using is. Here are some comparisons that have similar discharge current:
1. RC airplane batteries: $220
2. Motocycle LiFePO4 battery: $400
In particular, two of the Deltran BTL35A480C batteries should be equivalent to the Porsche battery in terms of amps and capacity. That comes to a cost of about 2x$200 = $400. Weight is also only 8 pounds.
http://www.batterytender.com/Batteri...t-Battery.html
Has anybody tried putting in parallel a couple of motocycle batteries like this to build an equivalent battery to the $1700 Porsche unit? Theoretically, it should meet or exceed the performance.
