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  1. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    Maybe. Could also be that the cells haven't been far enough out of balance. It is a relatively new pack. (Also I don't see any indication that the BMS is powered off only two of the packs cells)
  2. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    This theory makes sense and could be true, but I don't think my set up is behaving that way. I haven't fully "baby-sat" a charge cycle, I've had it running in the background, so I know the fan only runs when it's charging and it takes a few hours. Once the charger goes into standby mode, it...
  3. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    No, I don't have the patients or motivation to do a full discharge at a constant rate, plus I don't have a way to measure the Ahr through-put
  4. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    As the T-shirt says, I void warranties. Looks like the BMS in my particular Luna pack is the same one being sold here: https://m.aliexpress.com/item-desc/1206415913.html (assuming no modifications implemented by the pack maker) As mentioned, balance turn-on voltage is close to 4.2V. Seems with...
  5. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    Agreed with all, in principle. However this charger is definitely not sophisticated enough to hold a Constant voltage charge. Once it gets to the hardware-controlled set point, it switches off. As a side note I think people are over obsessed with charging 18650s to 100%. Unless you really...
  6. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    Hmm... I've been thinking about this and it doesn't quite make sense. Here's what I've come up with: The short answer is, it can't be that risky, if Luna sells an "80%" charger for their packs: http://lunacycle.com/batteries/chargers/luna-charger-52v-advanced-300w-ebike-charger/ The longer...
  7. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    Huh. It had never occurred to me that the BMS trigger voltage would be that high, but thanks, that is good information. Even though there is a lot of tolerance built into the voltage divider circuit in the charger, the performance seems pretty stable and repeatable. I think I will install a...
  8. R

    Modifying (or fixing) output of cheap Luna Cycle 52V charger

    This is how I modified a cheap charger to better suite my needs. Disclaimer: I DO not recommend doing this yourself. Also I won't dive too deep into the technical background, because Wikipedia. I ordered a BBSHD kit last month with a Luna 52V battery, and for $30 added the lowest cost, 3Amp...
  9. R

    What Brand/Model Tires do you use on your Electric Bike?

    Kenda Kiiniption Mountain Bike Tire, available in 26" x 2.3" about $25 per tire, light weight, high pressure, awesome for Urban riding. https://www.amazon.com/gp/product/B0026LJX4U/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1
  10. R

    Cheap 48V Pocket Mod Scooter

    My new pack runs up to about 54V but I'd like someday to see how the motor runs around 60. Looking at the motor and seeing how over-sized it is, even for the mower, I'm thinking Craftsman found a supplier that already had a part on the shelf. (The brushes on mine looked brand new, but the...
  11. R

    Cheap 48V Pocket Mod Scooter

    Third and final chapter: Now that the Razor scooter had a battery worth 4x the rest of the bike, I figured why stop the insanity? I had a bunch of LEDs laying around and an old 48V to 12V converter. For the headlight I added a heatsink, some lenses and a little water-proofing epoxy. I had...
  12. R

    Cheap 48V Pocket Mod Scooter

    After a winter of neglect, one of the four original 7AHr lead acid batteries had lost a cell and little scooter was only good for a couple trips up and down the street. I started thinking about building my own lithium pack, but didn't want to put too much money into a $100 project. It happened...
  13. R

    Cheap 48V Pocket Mod Scooter

    Time to start documenting a few EV projects sitting in my garage. I'll start with this one: The goal was to build an easy, cheap, electric pit bike (mission accomplished). Last year I picked up a non-running Razor Pocket Mod scooter of CL for about $20 (Or was it free? Who can remember)...
  14. R

    Bafang - poor quality control

    Slightly related- I'm in the middle of my own install, and I'm finding the M6 fasteners for the triangle bracket will not thread into the motor housing. I assume I will need to re-tap the motor housing. The fasteners included in the kit seem to be 6mm x 1mm... but does anyone know what size...
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