battery charge

robdon

Esteemed Pedelecer
Nov 5, 2013
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-71
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
 

jackhandy

Esteemed Pedelecer
May 20, 2012
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the Cornish Alps
just a stab in the dark...

Cold weather, maybe: Try charging somewhere q bit warmer.
 

patpatbut

Esteemed Pedelecer
Apr 25, 2012
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79
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
 
D

Deleted member 4366

Guest
Could we have some details of what battery it is? A link would help.
 

D C

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Apr 25, 2013
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Cairngorm National Park
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.
 

robdon

Esteemed Pedelecer
Nov 5, 2013
267
-71
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
 

patpatbut

Esteemed Pedelecer
Apr 25, 2012
859
79
Have you check the voltage out from your charger using voltmeter?
 

pdarnett

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Jul 5, 2013
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www.mybigdaydj.co.uk
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.
 

robdon

Esteemed Pedelecer
Nov 5, 2013
267
-71
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

ROB
 
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D

Deleted member 4366

Guest
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.
 

robdon

Esteemed Pedelecer
Nov 5, 2013
267
-71
charger output 42.2 volts
battery output pins 39.1 volts
at battery charging socket 38.6 volts
ROB
 
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