February 1, 201412 yr I have a new battery 36 volt 15ah which will only take 39.5 volts when fully charged, this is measured at the output pins of the battery, have tried to charge more but charger shows green, charger output 42 volts. anyone know what is wrong, I read that it should charge to 42 volts. ROB
February 1, 201412 yr just a stab in the dark... Cold weather, maybe: Try charging somewhere q bit warmer.
February 1, 201412 yr BMS in the battery shut off possibly. Try to charge it overnight to see if it helps. If not, you might need to open the battery case to check each cell. How old is the battery btw? Pat
February 2, 201412 yr I would check your meter is accurate before going further, I've been led astray by faulty measuring equipment in the past. Apologies if you've done this already.
February 2, 201412 yr Author information on battery : 36 volt 15 ah external fuse on handle, Diamond Power LI-ION BATTERY International Development Ltd dpowercar@gmail.com batteries 5 in a row blue colour with barcode 7 cm long ROB
February 2, 201412 yr information on battery : 36 volt 15 ah external fuse on handle, Diamond Power LI-ION BATTERY International Development Ltd dpowercar@gmail.com batteries 5 in a row blue colour with barcode 7 cm long ROB if you want some help give us a 'kin link to the thing.
February 2, 201412 yr I think Dave means where did you buy it from, paste the link in so we can do a little investigation. Some pictures of the pack might help as well.
February 3, 201412 yr Author bought on ebay for £210.00 had just come from China, person had just paid £40+ for courier and taxes, everything in the box was spanking new http://i843.photobucket.com/albums/zz360/robdon6robdon/DSCF0592_zpsae8a0ecd.jpg ROB
February 3, 201412 yr I would start by measuring the voltage from the battery and the charger with the same voltmeter. Please report the two results here. Without a picture of the battery, it's very difficult to give you exact help, but the next test would be to measure the battery voltage at the charge socket.
February 3, 201412 yr Author charger output 42.2 volts battery output pins 39.1 volts at battery charging socket 38.6 volts ROB
February 3, 201412 yr Author it is nearly the same as this in looks http://i843.photobucket.com/albums/zz360/robdon6robdon/36v-15ah-lithium-ion-electric-bicycle-battery-packBMSbattery_zps86a5703e.jpg ROB
February 3, 201412 yr OK, You now have to open the case, Remove the top (4 screws) and let it dangle while you look at the cell-pack. You need to locate the Multi-pin connector that joins the cell-pack to the BMS. Sometimes, it's there staring you in the face. Other times, its covered by heat-shrink. If you cut the heat-shrink in the four corners, you can peel it back. underneath is often a a square of GRP or cardboard stuck to the top of the BMS with double sided tape. The bond can be very strong so you might need some force to lever it off. Just be careful if you use a metal lever not to touch the BMS PCB to cause a short. Now the BMS should be exposed. It might be a PCB or a box. If it's too far down to get access, you have to slide up the whole cell-pack, which means that you have to unscrew the bottom piece. Then you turn it sideways on, stand the pack on it and pull the case down. it should push the pack up through the case. you only need to move it an inch or so. Now you should be able unplug the 10, 11 or 12 pin connector and measure the individual cell voltages. Put your voltmeter probe on one end of the connector, and work your other probe along each position of the connector until you have 10 readings. They should increase in sreps of approximately 4v, i,e, 0v, 4v, 8v,......, 39.1v. Please post the results here. If you have any problems, or it doesn't work out like above. Please post a photo of where your problem is.
February 3, 201412 yr Author is it attached to a ribbon type cable, if it is it has a type of steel plate thing screwed to it , similar to the brass studs you fix a motherboard to a computer case, can1t see any where to test yet .the ribbon type cable has,1 red wire, 9 white wires, and one black wire, if I pulled it off, it might be hard to get back on ROB Edited February 3, 201412 yr by robdon
February 4, 201412 yr Author I will post a photo tomorrow, going to bed, I do not think I should do this when I am tired. thank you for all your help ROB
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