Suggestions where to buy a 48v battery in EU ?

[Scorpio]

Hi everyone, I'm looking to upgrade the 36V/13Ah (468 kw/h ?) downtube battery that came with my Yose kit.

The KT controller is dual voltage 36v/48v so I'd like to move up to 48v.
Am I right in thinking this will increase the speed of the motor but make little difference to the torque?

The bike is used for light touring and commuting duties so any decent battery will be ok, no need to pay extra for top spec cells.
Capacity now is just about ok so I'm looking the smaller 48v options rather than 15ah or above.
I'm based in Portugal so buying anywhere in EU is fine.

Suggestions welcome

PSW have 48v/13ah (624 kw/h ?) from Germany for 144 euros which looks ok, the only downside I can see is it has generic "cells from China" ( their larger batteries have Samsung cells)

Electric bicycle ebike Battery Hailong G70 G56 Pack 48V 36V 17.5AH 15AH 20AH 13AH Bicycle Lithium ebike Battery Lithium fits1000W

Electric bicycle ebike Battery Hailong G70 G56 Pack 48V 36V 17.5AH 15AH 20AH 13AH Bicycle Lithium ebike Battery Lithium fits1000W

www.pswpower.com

Yose prices all seem very high https://yosepower.com/collections/e-bike-battery

Any others I've missed?


Link to the build thread https://www.pedelecs.co.uk/forum/threads/yose-350-rear-hub-kit-transplanted-onto-scott.40186/

many thanks

 

[portals]

52V batteries are only a little more expensive than 48V and the KT controller will have no issue, gives you just the small amount or additional power.

 

[matthewslack]

52V steps into another legal issue: some regulations require voltage to be not exceeding 50V.

48V nominal batteries have 13 cells in series and fully charged voltage of 54.6V, so open to interpretation.

52V nominal, 14 cells, fully charged voltage 58.8V, no room for interpretation.

 

[Nealh]

48v will increase motor rpm speed and torque by up to 33% over 36v.

Power output will increase 36v/ 15a approx . 400w from the hub and at 48v/15a approx. 540w from the hub.

 

[Nealh]

A display will show far greater figures then those I have posted , the display shows power/watts from the battery and not the motor output.
One has to allow for efficiency loss of 25- 30% with a hub.

 

[Az.]

Saving few quids on cells is a false economy. PSW sent me by mistake 36V 13Ah battery. It is rubbish. Samsung batteries are cheap enough and good value for money.

 

[saneagle]

Hi everyone, I'm looking to upgrade the 36V/13Ah (468 kw/h ?) downtube battery that came with my Yose kit.

The KT controller is dual voltage 36v/48v so I'd like to move up to 48v.
Am I right in thinking this will increase the speed of the motor but make little difference to the torque?

The bike is used for light touring and commuting duties so any decent battery will be ok, no need to pay extra for top spec cells.
Capacity now is just about ok so I'm looking the smaller 48v options rather than 15ah or above.
I'm based in Portugal so buying anywhere in EU is fine.

Suggestions welcome

PSW have 48v/13ah (624 kw/h ?) from Germany for 144 euros which looks ok, the only downside I can see is it has generic "cells from China" ( their larger batteries have Samsung cells)

Electric bicycle ebike Battery Hailong G70 G56 Pack 48V 36V 17.5AH 15AH 20AH 13AH Bicycle Lithium ebike Battery Lithium fits1000W

Electric bicycle ebike Battery Hailong G70 G56 Pack 48V 36V 17.5AH 15AH 20AH 13AH Bicycle Lithium ebike Battery Lithium fits1000W

www.pswpower.com

Yose prices all seem very high https://yosepower.com/collections/e-bike-battery

Any others I've missed?


Link to the build thread https://www.pedelecs.co.uk/forum/threads/yose-350-rear-hub-kit-transplanted-onto-scott.40186/

many thanks

It's a direct 30% increase in torque and motor maximum speed (13S vs 10S). The way to understand it is that the controller fires pulses of electricity at the motor. Each pulse does a little bit to knock the motor around. The amount of energy in each pulse is given by the product by the voltage (height of the pulse) and the time it lasts (width of the pulse). Increasing the height of the pulse therefore gives an increase in energy and a bigger knock. The current is the sum of the widths of all the pulses. If you make the pulses wider, you also get bigger knocks, or you could increase the frequency of pulses, which would give more knocks per second. The controller works by adjusting the frequency and time of the pulses. It does it the same, regardless of voltage, so 30% higher pulses will always send more energy into the motor, which provides the torque.

There are two good sources for batteries. Greenlance and Yose. Greenlance are better on communications and a little quicker on delivery, but they're both exceptionally fast and reliable. The decision will probably come down to who's got what in stock. Greenlance are always offering vouchers for 5% or 10%, so make sure you get one before ordering.

I wouldn't go as high as 14S/52V because you can make the motor too fast and get efficiency problems. The extra speed is OK if you need and use it, but if you want to keep to the 15.5 mph limit, it has more downside than upside.