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  1. S

    How to keep LiFePO4 warm in cold climate?

    I am currently running tests by placing a sample pack of A123 AHR32113s 4S1P in the refrigerator in a project box to simulate trying to warm these up from cold climate and am having difficulties. These cells will be placed in a vehicle on a much larger scale that are not easily removable. The...
  2. S

    Internal Resistance in question with Discharge rate

    Ok, here is one- http://www.electriccarpartscompany.com/b-20Ah-32V-64W-5C-b-br-Aluminum-Encased-Battery-br-ISO9001-CE-UN383-MSDS-certified-br-Lithium-LiFePO4-LFP-Custom-Built-Battery-br-h3-4000-Cycles-Continuous-Charger-Cycles-br-Click-Image-Gallery-to-see-Cycle-Graph-h3_p_113.html And the...
  3. S

    Internal Resistance in question with Discharge rate

    Unless I am forgetting something, isn't Internal resistance directly related to the max potential discharge rating of a cell and it's potential voltage drop under load? IE- a cell with lower internal resistance will have a higher burst rating and lower voltage drop under load, correct? If so...
  4. S

    Is LiFePO4 worth investing in?

    A123 sent me the file. AMP20 states- Discharge- 10C/30C Tested at 14PSi Now, forgive my noobness but i've never had to "compress" a lithium cell before so what are the common methods a user would know it's compressed properly for best performance? I see people mention foam but that's no way...
  5. S

    Is LiFePO4 worth investing in?

    They have the same files... But did anyone know they, a123batteries.com, have an AMP-18 pouch? I didn't know A123 had this and it's considerably cheaper $1 to amp compared to the AMP-20
  6. S

    Is LiFePO4 worth investing in?

    I have seen the data sheet provided on A123 many times and i cannot find any info on their site about proper installation of their AMP pouches. I guess i will email them.
  7. S

    Is LiFePO4 worth investing in?

    I have seen the data sheet from buy123.... but it doesn't physically list the Continuous and Burst C ratings. From doing brief research on this forum, it seems if i want to take a risk and save money with AmP20s, i should go through OSN. But.. i've also seen no consistent method listed on...
  8. S

    Is LiFePO4 worth investing in?

    Does anybody know what the ACTUAL discharge C ratings are for A123 Cells and how do i know i'm getting the correct ones? I just did a search and all providers give different values. This is no lie, there are all the values i was given from different providers- AMP20- 5C / 20C 10C / 30C 20C...
  9. S

    Is LiFePO4 worth investing in?

    Ha! You aren't kidding! When i was suggested here to wire the 48 prismatics(if i went with those) as 4S12P.. i almost fell out of my chair because that immediately told me i would need some ridiculous wire gauge. Doing some calculations, i came up with- Buss bars on them would be good for...
  10. S

    Is LiFePO4 worth investing in?

    YEs fixed at 12v. 9800A burst total draw from devices. 7300A comes from the requirement from Lithium alone. The other 2500 comes from AGM batteries. There is a light mix of both technologies for even weight distribution and some lee-way with voltage swing. They will be separated when...
  11. S

    Is LiFePO4 worth investing in?

    As ironic as it sounds from me talking about loud music, i personally like it for maybe 10 seconds.. then i'm done, :) It's great feeling that you get nowhere else. Also being able to use it for fun at shows, etc For actual listening, it's turned way down. I have to be able to see out of...
  12. S

    Is LiFePO4 worth investing in?

    Long life span = given some abuse here n there will shorten it's life but longer life should still provide longer life than shorter life cells being abused as well. (abused meaning running way over standard C discharge) Ultracaps are too expensive because they have no reserve power to them...
  13. S

    Is LiFePO4 worth investing in?

    That's exactly what it is. They mention nanotech in their batt description. No hydraulics at these shows although they used to tie them in a long time ago. While the majority of events have the music inside the vehicle, sometimes we just have to go crazy-...
  14. S

    Is LiFePO4 worth investing in?

    Yes I agree. The Good Group 31 AGM batteries can handle upwards of around 700A for several seconds while still staying around 10.2-10.6v for 15-30 seconds straight. It's good and all but doing that to AGM will definitely destroy their life compared to lifepo4 assuming i stay away from over 80%...
  15. S

    Is LiFePO4 worth investing in?

    48 cells- 4S12P 12P x 60aH = 720aH
  16. S

    Is LiFePO4 worth investing in?

    I am easy to deal with in terms of limitations. Weight- no limitation. Being used over 10 AGM batteries as typical requirement.. lithium anything is a miracle technology in that sense. It would be some AGM and the rest an unlimited amount of lithium cells in terms of what is required to run a...
  17. S

    Is LiFePO4 worth investing in?

    I am going to ask very generally in the following context- I am in a hobby where the limitation of batteries becomes more of weight than cost or size. Cost would then be the next limiting factor but that can be extended far past weight. Anyways, while having done some research here and there...
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