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Unread 28-07-2016, 22:14
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Tom Line Tom Line is offline
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FRC #1718 (The Fighting Pi)
Team Role: Mentor
 
Join Date: Jan 2007
Rookie Year: 1999
Location: Armada, Michigan
Posts: 2,513
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Re: Use of Lithium Iron Phosphate (LiFePO4) batteries in place of Lead Acid for FRC r

Quote:
Originally Posted by adciv View Post
To play the other side....

Between not just longer charge life, but longer cycle life, it can be cheaper to use a lithium over the legal SLABs. Yes they can cost several times more, but you aren't cycling your legal batteries as much and so they last longer. I remember one team saying they did so much off season stuff they used up 10 batteries a year. I'm not going to debate if that's due to misuse or what. Regardless, their life span is also longer and can result in long term savings to a team.

At work, we expect a SLAB to last 2 years if not heavily cycled. In FRC I have found we will get 3 or 4 seasons. At work, we expect a lithium to last 5 to 10. Even with the increased up front costs, this can yield substantial savings in the long run.
10 batteries isn't outlandish. We usually lose 4 or 5 a year, and I can remember a couple years ago when we did a lot worse. Some of the team were hot-cycling batteries to complete discharge at a week long fair demonstration without realizing what would happen. We lost around 10 that year.
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