Sondors Bike. Matching battery/display

[Jg980]

Hello. I have recently got a Sondors fatbike. I do not know much about e-bikes. It has the following specs:

KT-LCD3 V3.0 7H 60V Display

L60 Triangle Battery 60v 17.3ah Samsung Lithium Ion​

I am seeing symtoms that these parts are incompatible. The symptoms are:
-Wrong readings on display
-Lower top speed (i think. Top speed is ~35kph)
-Bad battery performance (full to zero after ~30 kilometres)

Still, the bike works and i have been using it regularly.

I should also note that the battery had not been used for around 2 years prior to me getting it.

Could anyone help me identify and resolve the issue? Thanks in advance!

Johannes
Norway

 

[E-HP]

. The symptoms are:
-Wrong readings on display
-Lower top speed (i think. Top speed is ~35kph)
-Bad battery performance (full to zero after ~30 kilometres)

Still, the bike works and i have been using it regularly.

I should also note that the battery had not been used for around 2 years prior to me getting it.

- Does it display speed when coasting? If you mean the display reads the wrong speed, then it’s a matter of adjusting the parameters for wheel size and the wheel speed pulse signal.

- Lower top speed than what?

- You are lucky that the battery works after 2 years of non use. It’s possible that some of the cell groups are low and out of balance. Does it charge to full pack voltage (67.2v)? You may need to leave it on the charger for several hours (sometimes even days) to get all of the cell groups balanced in order to have the full usable capacity, assuming the BMS does balancing.

 

[Jg980]

- Does it display speed when coasting? If you mean the display reads the wrong speed, then it’s a matter of adjusting the parameters for wheel size and the wheel speed pulse signal.

- Lower top speed than what?

- You are lucky that the battery works after 2 years of non use. It’s possible that some of the cell groups are low and out of balance. Does it charge to full pack voltage (67.2v)? You may need to leave it on the charger for several hours (sometimes even days) to get all of the cell groups balanced in order to have the full usable capacity, assuming the BMS does balancing.

Thank you for replying. Im gonna test according to your responses and get back to you!

The reason i suspect its got a lower speed is becuase i have a 750w bafang rear hub engine, that logically i figured would run faster than 35kph with a 60v battery. I might be way off.

 

[E-HP]

It looks like someone performed an upgrade on the bike before you got it. If it’s the stock motor, then yes, upgrading from 48v to 60v should give you a noticeable bump up in speed (how are you measuring speed?). Are you riding at the top assist level (5).

 

[docw009]

My bafang G60 fat bike motor runs an indicated 28 mph (45 km/hour) on 48V. LCD3 display and a 25A KT controller. I agree that you should see more on 60V. Perhaps your LCD3 is reading low.

The LCD3 allows you to set a wheel diameter of 26, 700 and 28. You want to be either 700 or 28, whichever is closest to your actual wheel diameter. The P1 and P2 settings are usually 100 and 6 for a Sondors fat tire bafang motor.

You can adjust P1 proportional to the actual speed you are getting. For example if it says 30 km/hour and you know that is 10% slow, increase P1 10%. The P1 setting only affects the speedometer reading, not the actual speed.

I believe the odometer is based off the P2 and the wheel size. I own several bikes with LCD3 with the same controller/motors but different tire sizes, I can get the speedometers to agree by adjusting P1, but there is no way to get the odometers to match because you can only input 26, 700, 28, not the actual wheel diameters,

In short, it's my opinion that if the bike is running, it won't run any faster with different LCD3 settings. You're just making the speed read differently. Exception being that you can make it run slower with the C5 current setting, and there's some variation with the c14 setting,

 

[Jg980]

- Does it display speed when coasting? If you mean the display reads the wrong speed, then it’s a matter of adjusting the parameters for wheel size and the wheel speed pulse signal.

- Lower top speed than what?

- You are lucky that the battery works after 2 years of non use. It’s possible that some of the cell groups are low and out of balance. Does it charge to full pack voltage (67.2v)? You may need to leave it on the charger for several hours (sometimes even days) to get all of the cell groups balanced in order to have the full usable capacity, assuming the BMS does balancing.

I did some measuring today.
- It does display speed when coasting, but it goes up to 79kph instantly. I will try configuring the p numbers
- I charged it from around 54 (bike didnt start) to 63.4 during a span of 8 hours. The charger read «fully charged». I left it on for a few more hours, and it had gone up to 64.1. After a quick ride (about 4km) on assist level 3 and 4 it had gone down to 62.0.
Are these normal readings? Would you advise that i leave it charging for a day or two in order to see if it reaches 67.2?

 

[99t4]

What are the specs on the charger? Can you post a clear photo of the label? Can you measure the voltage at the charger output connector?