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  1. D

    72V to 48V???

    I may be given a 72v pack soon. Both my bikes run on 48V. Is there any way to step down this voltage so it can be used? My thoughts: 1. A resistor in series...but this wastes a good bit of the power into heat 2. A DC-DC converter...but I haven't been able to find such a thing...lots that step...
  2. D

    Battery Pack Repair

    I am doing some repair work on a 4s10p pack. Does anyone have an idea of how I detach/remove these black plastic holders shown in the picture, so I can get at the cells?
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    BMS - On/off switch using thermistor connection?

    Thanks for the suggestion. I assume that switch would need to be capable of carrying the full discharge amps load? 20-25 amps?
  4. D

    BMS - On/off switch using thermistor connection?

    I am replacing the BMS on a 13s lithium pack. The replacement BMS does not have an on/off connection for a switch but does have a temperature sensor (thermistor). I measured the thermistor resistance at room temp at about 1200 ohms. I heated it up with my heat gun and saw the resistance dropped...
  5. D

    Voltage at Discharge Port

    I have 5 lithium batteries (48V, 13s) that I use on my 3 bikes. They all seem to charge/work fine. However I was checking using my multimeter and observed something I hadn't expected. I was wondering if anyone can shed some light on this: - on 2 of the 5 packs I see the same voltage at the...
  6. D

    Compact display with usb charging for Bafang?

    Another approach would be something like this...
  7. D

    Advice on 48v to 12v LifeP04 reconfigure & bms

    If you are indeed seeing around 13 volts using 48 cells, your config must be 4s12p, not 12s4p. 12s with LiFePO4 is nominally 36V.
  8. D

    repair bike battery

    Or at times right on the BMS board.
  9. D

    repair bike battery

    You see anything on the BMS board or inline with the output wires that looks like a fuse or fuseholder? If so, check it for continuity.
  10. D

    +ve and -ve connectors - Controller side

    I am trying to help a friend retrofit a battery to his controller where the connectors do not match. On the controller side it is a 4-pin spade type connector (something like a Hailong setup). I know only 2 of the 4 connections on the controller side are used, but how do I determine which one...
  11. D

    Sourcing a Battery Mount

    Correct.
  12. D

    Sourcing a Battery Mount

    Thanks Here's a pic of the underside of the battery. This mount has a latch on the front (top)? as well as the connection at the bottom for the discharge port. The mount itself is keyed where the top latch is, not the pack itself.
  13. D

    Sourcing a Battery Mount

    I recently had my bike stolen (from my garage). The only blessing is that I had the battery pack in the house so still have it. However to use it elsewhere I am looking for the mount to put it on another bike. Can anyone point me to a site where I might find one? Also not sure what they call the...
  14. D

    At rest voltage and status of charge ???

    Here are a couple of generic charts I got somewhere where it has been translated to a 48V and a 52V pack:
  15. D

    13$ battery spot welder testing out

    Any link to where could one get one of these?
  16. D

    Lipo vs "deep cycle" marine battery capacity question

    You can ignore most of what I posted as at that earlier point in this thread, I assumed the OP was talking about 18650 lithium cells as he had not stated what he was using. As mentioned later in the thread, the discharge curves for the LiPo pouch cells may be completely different.
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    Lipo vs "deep cycle" marine battery capacity question

  18. D

    Lipo vs "deep cycle" marine battery capacity question

  19. D

    How to Use a Watt Meter

    In simple terms: The wattmeter can measure Ah used and Wh used. It has no way of knowing how much was in the tank when you started. You need to supply (or guess at) that and do the math. The post above gives some ideas on determining the starting battery capacity.
  20. D

    Golden Motor Magic Pie V 5 Wiring Color Codes

    Not sure if this helps. You can find more about the MP motors etc at: https://goldenmotor.com/SMF/index.php?board=15.0
  21. D

    Confusing battery info

    I have to say that is a VERY low price for a 48V 18Ah pack, especially with free shipping and Panasonic cells! $118Cdn is about $90USD. If you do buy one, I would be curious about how the transaction goes.
  22. D

    Axle trying to leave Dropouts when Tightening

    Where do you get through axle dropout plates and are they a universal fit or specific by frame?
  23. D

    Charging 14s pack with LiFePO4 charger

    Is there any reason not to charge a 52V (14s) Lithium Ion pack with a 48V LiFePO4 (16s) charger? The terminal voltages are almost the same.
  24. D

    Safe charging battery on the bike?

    To reduce the amount of time the charger is running while unattended, I use a simple countdown timer like this: https://www.amazon.com/Woods-Countdown-8-Hour-Grounded-Indoors/dp/B00FSQTSB8/ref=sr_1_43?keywords=woods+timer&qid=1567978715&s=gateway&sr=8-43 and set it for 1, 2, or 4 hrs depending...
  25. D

    Front wheel making a popping sound

    I'm not sure what the "popping sound" sounds like so this could be off base. On my fat bike bike I had a (crunching?) sound that I couldn't get rid of and eventually determined that the tire was not 100% properly seated in the rim - even though it looked fine. There are a number of posts on the...
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