Recent content by johnjapan

Appreciate the responses guys! I took apart the battery pack because I was packing it for transport and then changed my mind. When I reassembled it I accidentally dropped a screw between the pack and sparks flew It sparked for about 3-4 seconds then the screw fell to the ground and it stopped...

Omg Thankyou so much the black probe is as not in COM thank gir the cells are ok felt for one There is no Bms with this pack by the way The defective cell measures at 0.17 volts Trying to wake it up now hopeless?

Just checked the leads on my charger turns out they are reversed as well so all this time my charger has been reverse charging ! It's been working fine for a year but can I continue safely with this reverse issue?

**** ALERT UPDATE***** Yes red on + black on - gives a negative voltage reading Just found out that 1 out the 24 cells in the pack is dead! I've been charging my pack with 1 dead cell for god knows how long could that of caused the reverse polarity? Are you saying there is no way to fix this...

New update Just took apart the pack to check all voltages and noticed that all the cells poles have been reversed Somehow I backwards charged my whole pack where positive became negative and negative become positive are all my cells ruined? How do I get it back to normal ?

Oh oh, You're right so if the polarities are wrong would that damage the cells? Because I took apart my whole battery pack and found 1 dead cell with voltage of 0.2v I've tried leaving it in the charger for 4 hours but it won't hold the charge at all. I'll just have to figure out this polarity...

You bring up an excellent point! Everything was working fine before Until i removed 4 batteries from the pack and reconnected them, Maybe they aren't connected properly or I connected them in reverse but wouldn't there be shock / sparks if I did reconnect them properly? I will reconfirm the pack...

These are 24 headway cells 40152 I don't think they are sla no.

The APM is showing the wrong voltage and as a result the motor will not move at all I am stumped as to what the problem is, here is what the APM is showing around 46volts Here is what my 72 volt pack is showing around 75 volts I then connected the controller to the battery and probed the...

sorry if it sounded cheeky but it's my first time and I don't feel like getting shocked. If I understood the inner workings of electricity batteries and safety I wouldn't need to follow instructions like a programmed computer. Basically I need books or materials I could read and I'm not sure...

I need help on how to safely build a 72v 15ah headway brand pack that comes with bus bars and orange brackets. These are the 40152 cells. I am not a licenced electrician, nor a battery technician by any means, I have some basic knowledge soldering skills, and all the proper tools but I'm...

Everyone knows that motors have a very large thick long yoke to bolt on to the dropouts If for some reason the motor malfunctions your ebike is useless crap, If the frame is designed to only support thick dropouts I propose we need a special wheel without the motor casing that has the extra...

Are there any ebooks on amazon etc that help you trouble shoot ebikes anywhere from battery packs to controllers, to maintenance you know...something along the lines buying a book for trouble shooting regular bicycles?

Because I fear I may harm myself or property I have decided to step down and not attempt to repair the battery, instead I would like to read any books that would help one trouble shoot ebikes. I dont feel confident enough to do it. Thanks guys if you can recommend any books that would be great!

http://www.hobbyking.com/hobbyking/store/__5548__IMAX_B6_50W_5A_Charger_Discharger_1_6_Cells_GENUINE_.html Found the b6 Link above Is this good enough for balancing charging or discharging my 14s pack?