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  1. tmho

    The "Watch" feature

    It seems to me that the "watch" feature is not working for me. In the old version, I constantly received emails reminding me that there were new posts on the posts that I "watched". I forgot the term used for "watched" in the old version. But after changing to the new version, I seldom got...
  2. tmho

    How to charge an AGM battery without using an AGM battery charger?

    Recently, I got a 12V 95AH VRLA/AGM lead acid battery with just 11.17V. I found it is dry inside. I treated it as a regular lead acid battery. I filled it up with distilled water and charged it with a variable power supply. I set the current to 4A and charge it for about 6 hours. The...
  3. tmho

    Should derailleur protector be installed on an e-bike?

    Attached is a common derailleur protector in the market. It is supposed to be used to protect the rear derailleur in case the bike falls onto the side of the rear derailleur. Should it be used? Actually, the derailleur hanger is already protecting the derailleur. When the bike falls on the...
  4. tmho

    Can a swollen battery be fixed and how to do it safely?

    I have seen Youtube fixing swollen battery by making a hole to release the gas inside. But usually they also said do it at your own risk. Please comment if you know the answer.
  5. tmho

    SQUEAKING NOISE

    I found squeaking noise from the rear wheel of my Norco Kokanee. I have uploaded a video to Youtube https://youtu.be/8pSukSNUSpo It is not from the disc brake. Can somebody help me to find out where the noise coming from?
  6. tmho

    How to separate these LiFePO4 pouch cells?

    I got a 6s2p LiFePO4 battery pack from a friend. I have no experience in this kind of pouch cells. I want to separate them so that I can rearrange them for other purposes. What is the easiest and safe way to do so?
  7. tmho

    BMS Questions

    Recently, after changing the BMS of my 10S4P battery pack, I found that the voltage of group 7 will gradually decrease (much more when compared with other groups) even if the battery is not being used. When I disconnect the balancing connector, then the voltage of group 7 will stay just like...
  8. tmho

    Front suspension forks question

    I need a front suspension forks for one of my bikes. I saw a post selling one which I would like to buy. But from its photos, I found that there is a place that it is different from the front suspension forks of my other bikes. The difference is the angle of the drop out. Mine are parallel to...
  9. tmho

    Please help on connecting 2 groups in series

    I am building a 14s4p battery pack. I am going to use the hailong battery case. I also will install a bms. But due to the limited space problem, the 7th and 8th groups will be as shown on Fig. 1. The cell which I am going to use is capable of delivering 10A each. For the series...
  10. tmho

    Can Sunkko spot welder be used to weld pure nickel strip onto another pure nickel strip?

    I bought the Sunkko 737G+ spot welder (which should be quite powerful when compared with the other Sunkko models) recently for building my first diy battery pack. So far from my testing, at about 75% power setting, welding with 0.2mm pure nickel strips onto cells is no problem. But for the...
  11. tmho

    Will the battery pack okay if the cells are not glued together?

    This is another question for my diy project (https://endless-sphere.com/forums/viewtopic.php?f=14&t=97736) Since the battery case is too tight, if the cells are not put inside the cell holder, there will be more space for the BMS and wires. I saw a lot of people would glue the cells...
  12. tmho

    My first diy battery pack, need helps!

    I am going to build my first diy battery pack for my ebike. It will be 14s4p. Normal current needed is 10-15A. Maximum current is 20A. I will install the cells inside a battery case bought from taobao.com. I am planning to buy the Sunkko 737G+ for spot welding. Any comments on this spot...
  13. tmho

    Battery pack/BMS questions

    I found that the voltage of a certain group of my battery pack (16s5p) is always lower than the other groups. When the pack is fully charged and balanced by the BMS, that group will be the same as the others. But after using the pack, that group will be lower than the others. The difference...
  14. tmho

    Need help on my bluetooth controller

    I bought a Bluetooth controller above a year ago from taobao.com. I used it with a rear 500W hub geared motor. It worked properly at the beginning. After about 10 months, I switched it with another controller to try the PAS. I did not like the PAS and so I switched back to the Bluetooth...
  15. tmho

    How to open a twist throttle for fixing?

    I have a twist throttle which is not working. I would like to try to fix it. But it seems that there is no way to open it to expose the wires for checking. Below are some photos of my throttle. As you can see from one of the photos, there are 2 screws holding a cover which hides the wires...
  16. tmho

    PAS modification (adding an ON/OFF switch) question

    I have finished adding PAS to my e-bike and is working okay. I want to add a switch to turn PAS off when I do not want PAS. My plan to do this is to add a switch to one of the 3 wires of the PAS. Is my plan feasible? Below is the photo of my diy cable to be added in between the sensor and...
  17. tmho

    E-brake question

    I have a controller with 3 wires (white, purple and black) for the e-brake. The voltage between white and black is 4.72V. The voltage between purple and black is 4.32V. The voltage between white and purple is 0.505V. The controller came with a pair of e-brake levers which are also with 3...
  18. tmho

    Temperature Protection/Cutoff question

    I am planning to install a temperature cutoff (as per the link below) in my LiFePO4 battery pack (used in my ebike) for overheat protection. At what cutoff temperature should I choose? http://www.ebay.ca/itm/231726225774?_trksid=p2057872.m2749.l2649&var=530940204213&ssPageName=STRK%3AMEBIDX%3AIT
  19. tmho

    Connection Box

    I am looking for a connection box for making connection to the phase wires of my new controller. I am looking for something like the one in the below photo. But I could not find similar items from Ebay when I made a search for "connection box". Am I using the wrong words? What is the proper...
  20. tmho

    Help! Geared Hub Motor with abnormal noise at certain speeds

    Below is a link showing my geared hub motor is running with abnormal noise at certain speeds. (Please turn the sound volume to maximum in order to hear the noise clearly.) Since I do not have equipment to check the rpm of the motor, I only can use the ammeter of the power supply (at the lower...
  21. tmho

    Motor could not run smoothly in any of the 36 combos. Help!

    Edit: The title needs to be revised as above. First just something about the motor, it is a rear hub geared motor. For background details, please read https://endless-sphere.com/forums/viewtopic.php?f=3&t=73335. Last time, I finally opened the motor all up and could not find anything wrong...
  22. tmho

    Rear Hub Motor questions

    I am trying to install a rear hub kit which I bought several years ago. The rear wheel is with a 6 speed freewheel on one side and a disc rotor on one side. When I put the wheel onto the bike, I found that the wheel is not centered. The center line of the wheel is off to the rotor side by...
  23. tmho

    New Battery "Breaking In"??

    Is there "breaking in" for new battery as in for new car? If yes, what is the proper way for LiFePO4 battery?
  24. tmho

    Hub Motor questions

    I have a 48V 500W rear hub motor. I have not yet installed it to a bike. I have tested it. The no load maximum speed is just around 30km/hr. I wanted to increase the maximum speed to about 40km/hr under load. My weight is just about 140lbs. Can I do that just by replacing the controller...
  25. tmho

    Matching of Shifter and throttle for hub motor

    In my last build with a hub motor kit, I had problem that the twist throttle was interfering with the shifters. Finally, I had to install the shifters upside down which was not so good. Now I am planning for my next build with a hub motor kit. Could someone please show me some photos of your...
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