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  1. theabsurdman

    icharger failures, detail how your icharger failed

    My iCharger X12 started playing up a couple of months ago - consistently failing to balance string #8 however long I waited. Opening it up I found that the 8th (J42cg) FET had blown open-circuit. Not having any replacement transistors, I tried a temporary repair by desoldering #8 and replacing...
  2. theabsurdman

    Unequal numbers of cells in parallel groups?

    Imagine you had a 7s4p battery where one of the parallel groups was weaker (lower capacity) than the others. Is it allowable to add another cell to that parallel group (only) to boost it up? So that group would become 5p, which might now make it the strongest group in the pack. Are there any...
  3. theabsurdman

    Converting a 10s6p battery pack into a 7s9p

    I have a 10s6p e-bike pack that I want convert into a 7s9p without completely breaking down the pack so I have cut the nickel strip series string at 7s and am redistributing the cells from 8s-10s back to 1s-7s in parallel-connected groups of 3 by means of wires rated for 15A as illustrated in...
  4. theabsurdman

    Connecting identical packs in parallel with a single BMS

    Thanks for all your comments guys. I took my eye off this thread for a while but the input has been appreciated.
  5. theabsurdman

    Connecting identical packs in parallel with a single BMS

    Anybody? To clarify what I'm trying to achieve. I have 3x 10S6P li-ion packs that I want to make into 1x 10S18P pack running off a single BMS. So I have to connect the 10 parallel groups of each pack together. The problem is how to achieve that efficiently. I was also considering converting...
  6. theabsurdman

    Connecting identical packs in parallel with a single BMS

    Hi, I want to connect 3 identical 6P packs' parallel strings together side-by-side to operate as a larger pack off a single BMS - 2 questions: 1/ would it be sufficient to make the nickel strip connections between packs, illustrated by red lines in the pic below, to just 4 cells out of each 6...
  7. theabsurdman

    Newbie question re. using a balance-charger in combination with a BMS

    Thanks for your reply. So let's say I already have a battery pack with a BMS that I want to balance-charge with an iCharger. Are you saying I can't use the existing battery output lead (from the BMS)? Are you sure of this? How inconvenient!
  8. theabsurdman

    Newbie question re. using a balance-charger in combination with a BMS

    Building my first e-bike pack, I plan to have a BMS and a bulk charger wired to the BMS, but I also want to be able to use a balance-charger periodically to monitor and fine-tune the state of the in-series groups. The question is how to connect the balance charger to the pack? Should I unplug...
  9. theabsurdman

    Just scored a 20 yo Giant Lafree Twist Lite

    Indeed. I also unscrewed the battery mounting plate on the bike which had helpful "+" and "-" signs next to the respective terminals, albeit on the underside.
  10. theabsurdman

    Just scored a 20 yo Giant Lafree Twist Lite

    Just 2 battery connectors. My one didn't come with a key - no biggie, I'll find some way of securing the new battery to the frame.
  11. theabsurdman

    Just scored a 20 yo Giant Lafree Twist Lite

    True but I think the position of the original battery is the obvious choice.
  12. theabsurdman

    Just scored a 20 yo Giant Lafree Twist Lite

    No battery or charger, missing rear brake shoes and the SRAM 3-speed hub shifter held on with a zip tie - the seller wanted £200, I offered 100, arguing that, besides having to source battery and charger, I had no way of even knowing if the motor worked. We settled on 120. Somebody had...
  13. theabsurdman

    Giant Twist RS2 pedelec - can't (re)locate cadence sensor

    I had a look at the controller for the RS2 - see photo below. It's a different controller, differently wired from the Express. What is intriguing is an unused black 2-pin connector to the controller with red and white wires that looks like it could be for a speed sensor.
  14. theabsurdman

    Giant Twist RS2 pedelec - can't (re)locate cadence sensor

    Cheers for the tips. I'll do some experiments and report back.
  15. theabsurdman

    Giant Twist RS2 pedelec - can't (re)locate cadence sensor

    Thanks for responding, yes it's a speed (not cadence) sensor mounted on the rear triangle - I had my terminology mixed-up. On the Twist Express it detects a spoke magnet to determine speed. Derestricting simply involves mounting another magnet on the crank and relocating the sensor to line up...
  16. theabsurdman

    Giant Twist RS2 pedelec - can't (re)locate cadence sensor

    I recently acquired a pair of 10+ year old Giant pedelecs - a Twist Express and a Twist RS2 which are almost identical models except... The Express can be easily derestricted by relocating its cadence sensor mounted on the rear triangle detecting a magnet affixed to a rear wheel spoke but I...
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