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  1. H

    bosch batteries

    In the UK many ride speed bikes/self builds illegally, enforcement is very low and most just rely on getting away with it or a ticking off if caught and possible bike confiscation. There is a process to get a self build faster bike legalised but the hoops to jump through are many and then the...
  2. H

    bosch batteries

    Simply don't buy Bosch as they are anti competition based and only they can repair the motors, in fact they don't even repair your motor they swap it for supposedly another new one. Bosch are simply anti competitive if you keep the bike for two years then develop a fault after warranty ceases...
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    7 mile range on new fat-tire bike with Ultra. Am I doing something wrong?

    What final voltage or cell group voltage are charging to/trying to achieve ?
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    Watt hour for lippo and lithium-ion

    In real world use the lion should edge it due to it's safer lower discharge, lipo will hit the cliff at a bit below 3.6v for ebike use where as lion will be ok down to 3.2 - 3.3v. No one takes lion to 2.5v and again not many would take lipo to 3v let alone much below 3.6v.
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    48v 13s4p 18650 showing 0v for 12th cell group

    Looks like they might be Samsung 26F/J series clone. You can try the manual charge route but group 12 are not trustworthy and a liability, so be warned. Any attempt should be done using low ma say no more then 400- 500ma charger out side and keep a very careful eye on the process. If they were...
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    48v 13s4p 18650 showing 0v for 12th cell group

    Group 12 is toast, cause could be bad cells, Bms faulty or sense wire connection failed. Some pics of the battery cells, maybe someone can help out if your location is known.
  7. H

    Capacity difference

    Any battery will be dominated by the capacity of the lowest cells, more importantly is battery sag. The IR's need to be very close as does the voltage, test cells and weed out the poor ones. Charge cells first and then weed out any that self discharge. A mix of 2950 & 3000mah cells, the pack...
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    Covid-19 Reports by country/area/town/city

    Covid deaths 281 in UK now compare that with the annual death toll from Flu which is 8k - 20k per annum.
  9. H

    Covid-19 Reports by country/area/town/city

    53 have died in the UK since yesterday now stands at 233 died, about 5 -6k have been tested as positive. Again the latest batch of deaths are those with underlying health issues ageing from 41 - 92 years.
  10. H

    Covid-19 Reports by country/area/town/city

    Here in the UK as a whole approaching 200 deaths, small compared to the annual FLU death rate or 12k - 20k. About 92k - 93k tested but no overall mass testing only for those suspected, general though if unwell in the slightest everyone is being asked to self isolate. The worrying trend is likely...
  11. H

    Help me troubleshoot this pack please. How are these voltages?

    2600mah cells of which make, for instance if they are say Sam's they will be a crappy variant of the 26F. A very low current rated cell.
  12. H

    Help me troubleshoot this pack please. How are these voltages?

    What cells are being using and the current draw ?
  13. H

    controller for torque sensing BB

    KT make a TS controller but I have only seen it for sale as part of a kit. This Bafang TS controller is available. https://www.aliexpress.com/item/32787065325.html?spm=a2g0s.8937460.0.0.395f2e0eisHcK6 The issues might be compatibility as they are thin on the ground.
  14. H

    Li-ion cells cycle ageing

    As John & Honk have said this really is fantastic testing by Docware, so kudos for the time consuming work being put in and aired here for all to view the results :bigthumb:.
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    eBike related abuse

    I once passed a peleton of MAMIL's one Sunday morning and must have pissed off the Alpha male big time as he came riding after me throwing a few insults and then finally asking how I liked my girlie ebike, I replied it was very nice and popped the assist to PAS 5 and sped off leaving him behind...
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    How do I choose which battery is the best for my application

    I think the Op has done so by the choice of the two cells he is thinking of .
  17. H

    KT36SVPR-LCD Controller

    The 6 fet KT's suffer from thermal cut outs, warm weather riding especially when cooling is limited. Slow riding up inclines in high power mode is one cause asking for to much current. One needs to find ways of adding cooling for the mosfets extra heat sink or better still the addition of mini...
  18. H

    What is wrong with this product?

    The labelling is woefully wrong, 28ah ? Claims of over 9000mah per cell and only 3p for 18650, devil is in the detail or not in this case. Pack size is about right for 13s 3p config but certainly not top cells used and likely really crappy " fire brand cells" used, give it a wide berth and don't...
  19. H

    Bosch powertube repair

    Jimmy in London at ebikebatteries.co.uk I believe parallels the BMS to another source (likey the new cell pack) once this is done the old cells can be disconnected. Though if a cell group is toast the BMS may well be bricked. He recelled my brothers Bosch pack but that was a Gen 1 or 2 pack.
  20. H

    Small hub motor

    G370 201rpm is available form topbikekit $185.
  21. H

    BMS not charging or discharging

    Tbh that BG BMS isn't conducive for great cell cycle life, lvc detection/release is to deep.
  22. H

    Would anyone have specs on this cell?

    Yes it was a typo on my part, I have modified the post to reflect the error.
  23. H

    Would anyone have specs on this cell?

    From my experience the top 0.1v carries little capacity ( In a typical 10s5p or 13s 5p pack) and certainly no where near 10% of cell capacity or range. I find within 1 -1.5 miles that any voltage if charged to 4.2v is used up very quickly and cells are down to 4.1v or there abouts. For the sake...
  24. H

    Adding one battery in parallel to 5 serial connected battery pack

    NO. You are trying to parallel a single 12v to a quintet of batteries = 60v. You need 4 more 12v batteries to successfully make up two quintets of 60v then you can parallel together, but you will likely not fit them to your bike or gain much with any extra weight. As john has mentioned try a...
  25. H

    Paralleling uneven voltage cells?

    The transfer will be instant between the two and very very hot, I don't know the math involved but someone else more knowledgable will.
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