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  1. scoot

    GoPed ESR750EX SLA to LIPO conversion question

    unfortunately there really are no drop in (plug & play) lipos that I am aware of. Goped uses two to four 7s Lipo packs custom built from Battery Space... each pack has its own beefy full featured BMS. For a while (a year or more ago) you could get the packs and BMSs seperatly from Battery...
  2. scoot

    Is my new battery charger over-volting my Headways Batteries

    e-beach... if that was my Headway pack & charger, I would be very happy with how it is charging... perfectly balance charged and for Headways, the "surface charge" seems to be draining off evenly across the board for all of the cells. Even if they drop below 3.4 after a few hours, I'd say there...
  3. scoot

    Any Fresh High Quality SLAs Out There?

    B&B brand in the HR seies have a solid reputation for the high discharge usage we aspire to. As to finding "fresh" ones, I think that is probably a constantly moving target, although some vendors are probably more reliable than others... can't tell you which ones since I haven't...
  4. scoot

    Is this correct for a max discharge with a 7s4p pack?

    wesenell... A while back I was occasionally running a 9s life pack with the ESR controller. When all of the cells were topped off, the controller would not respond or turn on. After draining off the so called "surface charge", the controller turned on and worked fine. I don't remember the...
  5. scoot

    Headway batteries advice

    Out of the 50 or more cells from 3 different sources (production lots too probably) that I have played with (3 different packs), I have not had any problems like many of the issues I have read about on occasion out here. Sure, I have damaged some when pulling 25 amps (2C) from start to finish...
  6. scoot

    Headway batteries advice

    Ah ha, i think I found the name of the "bad blood" vendor finally. Do you think that you might have been thinking of EV Components :evil: As recall they alledgedly ran off with alot of customer money, and the company owner had a Tesla. Anyway, unless somebody disuades me, I think my next...
  7. scoot

    Headway batteries advice

    I think you might be mixing up HQ with that notorious outfit... heck if I can remember their name either :roll: ... but I think they were/are not afiliated. let's see how everyone elses memory is holding up though :oops:
  8. scoot

    SLA battery added to LiFePo4

    I tried something similar once. Used a Headway Life pack w/25 amp BMS in parallel with some SLA batteries. Used a Cycle Analyst meter to monitor the current in and out of the SLAs. My scooter is usually pulling 30 to 60 amps with some hard riding. Found the current draw from the SLAs was...
  9. scoot

    Quick-Swap Battery Modules

    Well I really like the "proof of concept" model you're working on... very clever and functional IMO. Should be very stable and protective, as well as convenient. :D I imagine you'll be modifying the screw attachment system for the Andersons so there will be no soft pack puncturing...
  10. scoot

    Where can I get a 12v 20a lith battery?

    Looks similar to this... perhaps the same, eh? http://www.batteryspace.com/LiFePO4-Prismatic-Battery-12.8V-20Ah-256Wh-10C-rate-with-LED-Balancing.aspx
  11. scoot

    My simple 2x4s cellog adapters

    and I have several 4s Headway packs (12v) that I run in 8s total (24v). So i see a benefit for my packs, surely. :wink:
  12. scoot

    LiFePo4 Balancing Question (fake imbalance?)

    One of my 8s packs has a cell (a paralleled pair actually) that was damaged from overheating during some misguided discharge tests LOL. It exhibits about 90% total capacity compared to the other cells in the pack. I keep that cell in the pack because i never got around to swapping it out and i...
  13. scoot

    LiFePo4 Balancing Question (fake imbalance?)

    Not necessary to disassemble the pack in any way to top off a single cell. But you will probably need to make new lead/connection of some kind to attach to the individual cell(s) that need topping off. If you are unable to safely access the cell tabs/terminals with aligator clip style or...
  14. scoot

    Yet another BMS!

    Pleases me very much to see someone making good use of Walls' design. Would have taken him up on his generousness and sharing had I the skills to build one myself. He's such a polite and helpful fella too. 8) I always wanted a custom BMS that is designed and built specifically for the...
  15. scoot

    How many cycles charge on an icharger before it breaks?

    That is normal for the balance charging cycle. As to your question, you might get a better idea from the RC Group forum where these are used extensively.
  16. scoot

    Lifepo4 won't stay balanced while sitting in storage

    Does each cell have its own charger? Is that how you are balancing initially? Assuming each cell was at the same voltage when you pulled off the charge power, and if after two weeks at rest the lowest you have is 3.45 volts, then I'd say that all the cells are still essentially "full". When...
  17. scoot

    Bottom Balancing? Top Balancing? Charging and BMS

    Yep, if I took every suggestion or assessment I read out here as gospel, I would certainly end up mighty confused. Sometimes even the overwhelming consensus can leave one under served at times... one case in point for my needs being the recommended use of a full featured BMS. But in this...
  18. scoot

    Bottom Balancing? Top Balancing? Charging and BMS

    Yeah, I recall back in the days of the Rickard thread. I was following it with some interest... enough so I guess that I decided to try out the bottom balancing concept with my newly assembled 8s Headway pack (first one BTW) ... mostly because I thought would be an interesting learning...
  19. scoot

    Float charging LiFePO4 batteries + analog BMS system?

    All of mine have been the screw tops :) EDIT: finally getting around to reading dogman's "never below voltage" thread... LOL :lol:
  20. scoot

    Float charging LiFePO4 batteries + analog BMS system?

    I think with my setup it is mostly about the balancer (discharging) and charger achieving a quazi equillibrium at the 3.45v per cell level. I can observe the ultra low current toggling off and on via the cycle analyst once they are balanced at 3.45v. As far as the headways go, most of my cells...
  21. scoot

    Float charging LiFePO4 batteries + analog BMS system?

    Well I have been using that approach on several 8s Headway packs for a couple of years now. Using 24v SLA chargers with CC/CV capability (fairly intelleigent bulk charger) and a standalone balancer with high voltage cuttoff at 3.75 volts (Chargery db8). The cells always settle down at 3.45v in...
  22. scoot

    Polar Wire Review

    Great discription icecube... useful to me anyway. I like a wire with a bit of memory like you described in some places. The polarwire.com site has a bunch of handy and really nice high DC current products too.
  23. scoot

    38120 cells for a 12v application

    Well first of all, I'm not feeling sufficiently informed (technically speaking) to comment regarding your scintillating relationship with your "hoe" :oops: , but you will probably need at least some means of electrical connection (wire & connector) for each cell end so you can either...
  24. scoot

    Headway battery problems

    A cell at 3.9 is not messed up... it is merely filled up. Manually balancing one cell at time would be the first order of buisness in my opinion also. And i suggest you remove the BMS while you do it. Once you have achieved that, then you may be able to better observe what your cells...
  25. scoot

    C-LiFe 18Ah LiFePO4 prismatics

    The physical dimensions of the 18ah cells are just perfect for my ESR scooter's battery pan. I have been on the perpetual hunt for the correct size/dimesion high C cell like that. I am afraid the 20ah A123s just won't fit. And if they really perform that well, then all I can say is I would...
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