Category Archives: lithium battery - Page 2

going to order leaf bike conversion kit with lithium battery

Posted by on March 2, 2024 Comments Off on going to order leaf bike conversion kit with lithium battery

Q:Going to order your 20 inch 72v 2500w bike conversion kit and will need a 72v lithium battery. Any recommendations? Like to have one built to these specs: 72v 40a BMS 1000AH

Here’s my Cargo Ebike: Eunorau G30 Orange Cargo Bike to check out the shape of the battery casing.

A: Yes,we can make 72V 18ah lithium battery.
Would you need 1000Ah?

Q: Also, on the 20″ 72v 2500w bike conversion kit, does it have Juliet connectors on all major components? Yes. I want a 1000ah pack.

A: 1000ah? It’s equal to 50 sets of 72v 20ah lithium battery. Your bike can’t carry these lithium batteries.
Your bike max use 72v 50ah.

Q: Ok. I’ll take the 72v 50ah lithium battery and it will lock in same position on the bike correct? 
And have a 40A BMS correct?(the controller in that kit is 40A max)
50ah I can ride for awhile between charges.
How many N.M. of torque does that motor produce?
On the 72v 2500w 20 inch bike conversion kit I also need a 7-speed freewheel. Will you install that as well? Eunorau G30 Orange Cargo Ebike

A: Yes.Can make 72v 50ah.But 3A charger charge battery is too slow.Also,too many cells.
We recommended 2 or 3 sets of 72v 18ah 40A lithium battery.That’s better than 1 set of 72v 50ah 40A

Q: What about 2 sets of 72v 30ah lithium battery?
I know even better 1) 72v 40ah 40a less cells and you can make it to fit in the housing of the frame .

A: Supply you frame size, let me check max can how ah.
We can customize lithium battery size as your frame.

60V 30AH electric bike triangle battery Custom

Posted by on August 26, 2023 Comments Off on 60V 30AH electric bike triangle battery Custom

Q: I’m interested in this 60v 30ah lithium battery but I have 2 questions. My controller has a max BMS of 45 and I see that this battery is rated for 30. Would that be an issue? If yes, can you guys increase it? The second question is that I like the size of this electric bike battery because it fits my frame. I was wondering if you can increased to amp hours from 30 to 35-40, without changing the battery size? I’d like to increase my range as much as possible. I don’t know if this is possible but I thought I’d ask.

A: 1. Your controller Max 45. — It’s fit for.  We can make battery’s BMS to max 40A or 50A
2. Yes, we can increased the Amp hours from 30ah to 35-40. If without changing the battery size. (Also, can supply your frame size to us. We can customize as battery as your frame.)

Q: I’m not quite sure which measurement is for the frame size, so I’ll just send 2 different ones, followed by a picture so you can see where I got them from. From the middle of the crank to the top of the seat it’s 17 inches, and from the middle of the crank to the horizontal top bar, it is 14.25 inches. However, I made a cardboard cut-out based on the dimensions provided on your website found out it’ll fit well. What’s the maximum amp hours that you can fit in a battery that size? 

A: We can make 60v 30ah fit for this frame.  (maybe 60v 35ah, 40ah)
If we can get actual size of this frame,then we can ask our factory to estimate max amp fit for this. 

Q: Going in a clockwise direction, the measurements are listed below:
444.5mm (across the top) X 571.5mm (bottom bar) X 279.4mm (vertical seat tube).

electric bike battery can’t be charged

Posted by on January 29, 2022 Comments Off on electric bike battery can’t be charged

Question:Ordered 1 set of electric bike battery one year ago,last night charged it for the whole night,rode it this morning,but the hub motor stopped less than 1 mile.

I found the green led on my charger always be on while charging,it can’t turn to red.

Answer:There are two leds on charger.One is green led,the other is red.
When red led be on that means it’s charging.It’s okay.
When green led be on,there are three status:
1.Full charged;
2.Charger doesn’t connected to battery;
3.Can’t charge li battery

Everyone know the first and second status.But the third status isn’t easy to identify.Above question belong to the third status.

Now we talk about LiMn2O4 battery.
1.24V limn2o4 battery:
Fulled charged:29.4V;Dis-charged:22V
Should charge battery before it drops 22V.
If voltage is less than 22V,the charger can’t charge battery because of over discharged.
2.36V limn2o4 battery:
Fulled charged,42V; Dis-charged:34V
Should charge battery before it drops 34V.
If voltage is less than 34V,the charger can’t charge battery because of over discharged.
3.48V limn2o4 battery:
Fulled charged,54.6V; Dis-charged:46V
Should charge battery before it drops 46V.
If voltage is less than 46V,the charger can’t charge battery because of over discharged.

Why li battery will be over discharged?
1.24V motor controller can work at 21V±1V;the under voltage of 36V controller is 31.5V±1V and the under voltage of 48V controller is 42V.
2.Li battery has BMS.If the voltage of 24V,36V,48V li batteries less than 22V,34V,46V.BMS will stop charging and protect cells.

We suggest charge your electric bike battery per 20 miles.
Now our motor controller works with LCD,this lcd can display battery voltage directly so that you know when you should charge battery.

electric bike battery can’t charge

Posted by on January 26, 2022 Comments Off on electric bike battery can’t charge

Electric bike battery can’t charge,how to handle it?


Question 1:Ordered 1 set of 36V/12Ah electric bike battery with charger from one supplier last March.Now the li battery can’t charge.I sent several emails to this supplier,no any respond.Angry and aspire to slove it,can you help me…

Last Monday,I charged it all the whole night,but the second day,when I rode for less than 1 mile,the motor stopped.Recharged it,found the green led always on,can’t turn red.

I DON’T KNOW how to deal with it.Need help…Thanks.

Answer 1:First you need volt-meter to measure the voltage of charger and electric bike battery.Then can find problem.

Answer 2:Full charged this 36V electric bike battery reaches 42V.
1.Use voltmeter to measure the charger can get 42V.If not,charger is broken;
2.Measure battery,output voltage:33~42V,battery is also okay.If less than 33V,can’t charge it.

Answer 3:Generally the charger can’t get trouble.The problem is always from cells.
If the electric bike battery voltage is over-low.Battery’s BMS will not allow charger to work. Can’t charge for ever.
You should remove the BMS inside ev battery and let it to charge cells directly.
When voltage of the whole cells is more than standard voltage and re-connect BMS to cells.

Answer 4:Ride e-bike about one year,never meet this problem.

Question 2:The charger output 42V,but battery is 31.5V.
Disconnected cover,found a printed circuit board.But don’t know how to handle it.

Answer 5:B- → battery – (connect the cathode of the last pack of cells)
D- → – (connect to lock)
C- → – (connect to cathode of charging point)

B1 B2….B10 connects each pack of cells.

Answer 6:Your charger can’t work normal.You should disconnect 10-pin connector.
Charge it from B- and the positive of electric bike battery,bypass BMS,directly charge cells.

Note:Generally BMS can protect cells over-discharge and over-charger.But if your motor doesn’t work,just led lights work(current is less than 1A),at this time,BMS can’t protect cells.It will over-discharged your battery and make the voltage is less than normal so that can’t charger it.

We suggest if don’t ride your e-bike for more than 1 week,please remove electric bike battery power connector.

How to replace li battery cells?

Posted by on January 25, 2022 Comments Off on How to replace li battery cells?

Lead acid,LiFePo4,LiMn2O4,any kind of battery has use life.Generally 1 year warranty for battery.

Battery is a special good that is different from brushless controller,hub motor.Why?Controller and motor,if you don’t use for 1 year.Still no problem.But battery,you should charge it each two weeks,even if you don’t use.

For lithium battery,there are many cells make up of one battery.
Below we talk about LiMn2O4 battery first.
Now 4.2V 4Ah LiMn2O4 cell is familiar with us.
7 series for 24V,10 series for 36V,13 series for 48V
1.1 set of 24V 16Ah LiMn2O4 needs 28 pcs cells;
2.1 set of 36V 12Ah LiMn2O4 needs 30 pcs cells;
3.1 set of 36V 16Ah LiMn2O4 needs 40 pcs cells;
4.1 set of 48V 12Ah LiMn2O4 needs 39 pcs cells.

Too many cells for one battery,only one cell is sick.The whole of battery will be broken.
You will find that,full chargerd your battery,but it only drive your bicycle several meters,the motor will stop.
Because BMS found one sick cell,in order to protect other cells.BMS turns off power.

Now you need to replace sick cell,pls test as below,you will find it.
It’s a 36V li-ion battery.
Remove the battery end cover containing the charger socket. You will find a printed circuit board (PCB).
It is a battery management system (BMS) which equalizes the charge in each of the cells.
The wire B1 is the one attached to the battery anode. Connecting his professional quality voltmeter to the battery anode and to the other nine wires in succession.

There is one 10-Pin connector on this PCB. (B10 B9 B8 B7 B6 B5 B4 B3 B2 B1)

Measure the voltage between
the green wire and other nine wires as below:

B1 green wire to: Specification
B2 yellow wire(the second wire) 3.6V ~ 4.15V
B3 yellow wire(the third wire) 7.2V ~ 8.30V
B4 yellow wire(the fourth wire) 10.8V ~ 12.45V
B5 yellow wire(the fifth wire) 14.4V ~ 16.60V
B6 yellow wire(the sixth wire) 18.0V ~ 20.75V
B7 yellow wire(the seventh wire) 21.6V ~ 24.90V
B8 yellow wire(the eighth wire) 25.2V ~ 29.05V
B9 yellow wire(the ninth wire) 28.8V ~ 33.20V
B10 black wire (the tenth wire) 32.4V ~ 37.35V
If the voltages are normal,all cells are okay.

Incidentally, 32.4V~37.35V + 3.6V~4.15V = 36V~41.5V

Then, measure voltage of the battery
without BMS (B- and battery anode) 36V~41.5V
with BMS (D- and battery anode) 36V~41.5V
If these two voltages are the same, then the battery pack is okay.

Note:If the voltage of any cell is more than 4.2V.I think the cell is overcharge.It can stop BMS and battery work.So you should find out which cell is over charged.

lead-acid electric bike battery

Posted by on January 14, 2022 Comments Off on lead-acid electric bike battery

One pair of lead-acid electric bike battery business of the special rectification action in the country’s largest production base bike conversion – Jiangsu, causing a chain reaction.

Electric car “sit in prices,” four or five hundred

“The electric bike battery I bought earlier this year, or a $ 500, now 700 yuan of how to become?” July 4, in Nanjing Ruijin Road, a brand of electric automobile electric car shop floor, the public dissatisfaction Chan asked shopkeepers.

Reporters visiting the market in more than 10 shops, each shop owner in the consumer, “Mozuipizai.” “After all, because electric bike battery in the price.” One owner said, the state strengthened the intensity of lead-acid electric bike battery after remediation, electric bike battery began to demand, “this two-day media a report, electric bike battery factory ‘ride in prices’, each up $ 20 a Electric cars use four electric bike battery, a rose is 80 yuan. ” Reporters asked a number of shops that sell, an electric car electric bike battery is good is 1,000 yuan, the poor have five 600.

The owner said, yesterday morning, the boss put the ready cash around to buy electric bike battery, “I heard that this month will be going up now are not we save point, it could take money can not buy, these days can only be changed supply channel. ”

electric bike battery prices, pushed up the price of electric cars. In a province famous brand of electric car shop, the boss out price list to reporters, “honest”: “In mid-June, we all sales shop in Nanjing uniform prices, the average one or two hundred.” But one industry price list after reading quietly told reporters, “The price of small cars rose two or three hundred dollars, increased more than 400 yuan.”

One has been engaged in the sale of electric vehicles for many years the owner said that from 2007 to 2009 the price of electric vehicles all the way up, we all make money on the entire chain. After 2009, rapid expansion of production capacity, the average price has declined by 400 yuan. “Now the electric car brands are doing the final assembly of integrated accessories factory prices rise, the pressure will certainly pass back.”

Reporters look at different stores that market, different brands, price increases are not the same, some tens of dollars, and some two hundred dollars. Suzhou, a brand of electric car dealers say,mainly a small number of big brand distributors and brand agents, their resilience and weak, big brand distributors in order to maintain sales volume, prices rose less up to less. “Electric bike battery prices, car prices have a good reason brewing end of this month, the price of electric cars will certainly continue to rise.”