It is a tale very commonly told that Lead Acid batteries are a “cheaper” solution than Lithium batteries for off-grid and solar storage. As of 2019 that is patently false, and the purpose of this article is to explain how this remarkable fact comes to be.1)This argument is true for LiFePO4. For LiMnCo batteries such as “Tesla” modules, this economic argument does not hold water as LiMnCo chemistry cells have a cycle life of 400 cycles or less and are not sensible for stationary energy storage use.

##### 5. But what about fire?

There is a misconception that all lithium batteries are dangerous and prone to runaway combustion. This is true for LiMnCo batteries such as those used in electric cars and cell phones, but it is not very true of Li-Fe batteries. LiFePO4 batteries have a lovely property where they become less able to provide electrical current as their temperature increases. This means that they won’t easily combust unlike LiMnCo batteries, which is among one of the biggest reasons investors bet big on the new chemistry.

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 1 ↑ This argument is true for LiFePO4. For LiMnCo batteries such as “Tesla” modules, this economic argument does not hold water as LiMnCo chemistry cells have a cycle life of 400 cycles or less and are not sensible for stationary energy storage use. 2 ↑ https://en.wikipedia.org/wiki/Peukert%27s_law