Thread: lithium ?
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Old 10-19-2019, 06:54 AM   #12
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City: Gloucester, MA
Join Date: Jan 2013
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Originally Posted by catalinajack View Post
How deep may LiFePO batteries be discharged without reducing their life beyond reason?

Figure 80-90%, and figure on getting at least 2000 cycles out of them, and probably a good bit more. Lab testing consistently yields 2000 cycles with 100% charge/discharge. I've seen no concrete data on longer life spans because it simply takes too long. But even at 2000 cycles, that's about 6 years assuming you cycle every single day, which very, very few boats do. Even half that cycle rate I expect is uncommon. Most people using them are expecting 10-20 years.
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