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    1. · Registered
      753 Posts
      so what i have learned, ... the batteries are not necessarily that much lighter in weight, they might be more in the 50% weight reduction range. also, there are many forms of lithium batteries. you probably would want to look at lithium iron phosphate battery (LiFePO 4 battery) or LFP battery. easiest to get into. (y) (y)

      Genuine Lithium Batteries for DIY Projects – Battery Hookup

      USED HEADWAY 38120 HP 3.2V 8AH LIFEPO4 BATTERY – Battery Hookup

      Wouldn't my alternator charge the batteries fully rather quickly?
      this is a really good question. i have not really seen a lot of info/data on this question. i picked up some of the headway cells, i'm in process of putting a pack together to test out. but a lot of guys have used this them successfully from my understanding. this is a maybe a complicated question, i suspect. some of the lithium batteries are rated based on alternator charging capability. you have probably seen that already.
    1. · Registered
      753 Posts
      you are correct the cells have no built in protection,... raw.
      it seems like they can do 80A continuous charge per cell,
      and 200A continuous discharge per cell.
      i assume they can tolerate higher level for a shorter time.


      you think the batteries would get so depleted they would draw that much from alternator?
      ... i guess it depends on how much / how long current is drawn off of them....

      you have any charge controller systems you like / recommend?

      the stuff you are saying could happen, but not guaranteed to happen, .... depends on how much current is drawn and the guys alternator charging voltage.


      You really should use a battery management module with these. Yes; they are more robust than other lithium chemistries from a safety point of view, but there's other concerns as well.

      Without a charge controller, you are likely going to exceed the max charging rate and end voltage on the cells as well as put excess stress on your alternator. Also, I think these are raw cells, without any internal voltage cutoff chips. The result will be reduced cell lifespan; and potentially immediate cell failure upon exceeding the lower discharge limits.
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