Emove cruiser
- Thread starter bnu
- Start date
I don't think you can connect the BMS to the controller. It only connects to the battery, except for the main thick + and - wires.
If you provide us *complete* information on the parts you have, including links to where they were purchased, we may be able to use that info to help you connect things up.
The less you tell us, the less we know, and the less we can help. Only you know what you have, and are trying to do....
bnu
1 mW
After a full charge my 52v 14s 4p 38000mah 18650
I'll ride on a slight incline I notice battery level at 5 drops 2 so at 58v riding drops to 54v n that's only less than 10 blocks to me that's dramatic has anyone come across this problem
I'll ride on a slight incline I notice battery level at 5 drops 2 so at 58v riding drops to 54v n that's only less than 10 blocks to me that's dramatic has anyone come across this problem
molybdenum
1 kW
Does the voltage come back up to near 58 after you stop? It's normal for a battery to experience a 4-5V voltage sag when under load riding and drawing amps. If the battery stayed at 54 volts when idle, it would be cause for concern.
offGridDownUnder
10 kW
bnu
1 mW
No. No it dies out after another 5-6 blocks it's funny cause I bought 2 of them they do the same
I bought them a while the use was less than 10hr
I bought them a while the use was less than 10hr
bnu
1 mW
No wen I did use it had a good range of traveling
So I'm dumb founded
So I'm dumb founded
eMark
100 kW
AliExpress and other Chinese (no name brand cells) flat or hailong batteries rated at e.g. 38000mAh (instead of 38Ah) are overrated with questionable A-grade cells). It's likely closer to 12Ah capacity (4p with 18650 cells). Even with 21700 cells (4P) the Ah capacity would at most be 20Ah (4x5000mAh).
A more reliable 14s4p Lithium ion ebike battery with name brand 21700 5000mAh cells (LG-50E 20Ah) will cost $369 ...
52V 20Ah LG Lithium Ion Ebike E-bike Battery Electric bike Bicycle Kit Battery | eBay
52V 20Ah 40A BMS Fit Motor Power : 52V or 48V 250W 350W 500W 750W 1000W 1500W (Max Matching 1500W). Rated Capacity: 20Ah. Each cell has its own fuse for ultimate in safety. It has a great cycle life:≥80% Capacity After 1000 Cycles, no acid.
www.ebay.com
A 14s10p (38000mAh) Lion battery would have 140 cells with each cell having a realistic use rating closer to 3800mAh (Smsung 40T) for cycle life.
Chalo
100 TW
When Chinese battery hustlers claim unlikely capacities and specify them in mAh, you can bet that they're summing up all the cells by mAh without regard to whether they're series or parallel. So let's assume 2200 mAh per cell, which is common for generic Chinese 18650. 38Ah/14S = about 2.7Ah per parallel group. So that would be either a single string of 2700 mAh cells, or 2P of 1350 mAh cells. Or God help you, 3P of 900mAh cells.
How big is your pack, dimensionally? Can you count the apparent number of cells in it? (Note that some pack builders will insert dummy cells or spacers to fill empty slots.)
How big is your pack, dimensionally? Can you count the apparent number of cells in it? (Note that some pack builders will insert dummy cells or spacers to fill empty slots.)
eMark
100 kW
... and 4P would be 678.5mAh or 38000 divided by 56 cells (14s4p) also equals 678.57mAh. An yet we know they are using 18650 cells having at least 2200-2500mAh capacity.
In order for a 14s4p 18650 battery to have an actual capacity of 38000mAh each of the 4p 14s strings would have to have a capacity rating of 9500mAh (38000 divided by 4p) with each cell rated at 2375mAh to justify the inflated fictitious capacity rating of 38000mAh.
Thus, if each cell of the 56 cells was rated at 2375mAh. Then 4p would have a rating of 9500mAh. Then four (4p) 14s strings times 9500mAh equals a fictious 38000mAh rating; while the actual rating is 9.5Ah.
Figures don't lie, but L.C.F .
Shouldn't milliampere-hour (mAh) figuring be the same the world around? So how does China (e.g. AliExpress) get-away by knowingly (unethical) inflating of ebike/scooter Lithium-ion battery capacity ratings? Guess it's the responsibility of the customer to know suspect lithium-ion battery capacity ratings when listed in thousands of millampere-hours ... BUYER BEWARE !
Last edited:
It is, but in addition to what Chalo was mentioning about the way they just add all the mAh hours, bigger numbers advertise better. 9500 is a bigger number that looks nicer than 9.5
docw009
10 MW
Hillhater
100 TW
If that is the claimed capacity, it would be close to a 2 kWh pack and weigh about 10 kg !…..which i doubt .
but even if it is a low..< 10ah.. capacity, it should not die so quickly.
So, I suspect you have some bad cells it there somewhere……which is likely why they were sold !
Warranty ?
eMark
100 kW
Buyer Beware of any ebike/scooter Chinese (flat or hailong e.g. *14s4p battery with a milliamphere rating (e.g. 38000mAh) instead of say a 10Ah, 12Ah, 15Ah or 20Ah rated capacity. Most likely it's price is too good ro be true (e.g. *$200) having questionable A-grade cells (B-grade) without cell separators (cells glued together). The cells should have a 10amp rating,but may only have a 5amp MCD rating. If that was true then that 14s4p battery may only have a 20amp BMS. If the cells were rated at 10amp MCD then a 30amp BMS would be AOK for that 4p battery instead of a 40amp BMS.
Last edited:
floydr
100 W
Also if the mAh rating divides into more than 3500 mAh Buyer beware for example the 14s4p 38000 mAh 18650 in question divides into 38000/4 = 9500mAh almost 3 times the best cells out there. This pertains to 18650's only
Later floyd
Later floyd
Chalo
100 TW
We don't know that, actually. I've seen cheap Chinese junk use 18650 cells that were labeled 500mAh or less, and weighed accordingly. 1500 mAh is a very common rating for 18650 cells in consumer crap, and there are many levels down from there.
eMark
100 kW
Assuming that it's 'actual' 4p capacity is around 9.5Ah ... not its 'make believe' capacity of 38Ah then 9500mAh divided by 4 = 2375mAh (cell capacity) which may be for this (bogus 38Ah) 14s4p L-ion 18650 battery.
It looks like AliExpress and Alibaba are removing those 100000mAh and other inflated capacity batteries. Most likely due to so many complaints of false advertising.
Hillhater
100 TW
What ever its real capacity is, if its dead after just a few blocks,.there is an internal fault in the pack.
The fake capacity lable is just a clue as to the quality of the pack and the integrity of the vendor.
Gruesome
1 kW
bnu
1 mW
To be honest don't remember
bnu
1 mW
Can someone help me understand how to determine to pick out a 52v battery pack
understanding wat does 14p 14s do
understanding wat does 14p 14s do
bnu
1 mW
I have 52v controller 10in 1000w motor looking for a battery range give or take 40 miles
bnu
1 mW
Hand me down emove cruiser the wiring is wow
Wondering if I could start fresh without some of components like the can this b done or it's best to buy another controller I'm familiar with JP controller n wiring
Wondering if I could start fresh without some of components like the can this b done or it's best to buy another controller I'm familiar with JP controller n wiring
Similar threads
- Question
