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Info about battery pack


#1

HI everyone!

In the past few days I’ve read a ton of guides about how to build esk8 and I’ve got a project in my mind…there’s just one problem, battery.
I want to build something that won’t catch fire and that I can bring with me everywhere, I cannot use Lipo batteries and Lifepo4 are just too big (and also not 100% safe), also I cannot afford the enertion space pack right now if I have to buy all the other parts.
What can I do? This thing is driving me crazy, also I’d like to be able to charge the eskate without having to pay too much attention to the charger…is there any way I could build or buy a BMS?


#2

There are a ton of 18650 build threads on here. Check them out for some inspiration. I am building a pack with A123 26650 Lithium Iron Phosphate cells soon. I just need to gather some tools and stuff to build it.


#3

BMS can be bought from Battery Supports. They are supposed to be pretty good quality.


#4

Check these two links out… One is a battery template I put together with a parts list an wiring diagrams… The second is a link to a group buy that just recently finished up and some people will be doing build threads when they can do one… Here you go


#5

Thank you everyone!

So basically I can buy 10 1cell 18650 and connect everything to the 38$ BMS right? That sounds awesome, it’s not even that expensive!


#6

How many volts do you want and how many mah? If you are doing a 10S1P then yes 10 cells is right. If you want more range increase the amount of batteries in parallel.


#7

It’s a 1 motor build, it’s better if I do 5000mha ad 12v or 10000mha at 6v? I’m worried that 6v it’s not enought but it’s a normal skateboard, not a longboard


#8

You need at least 22.2 volts.


#9

Oh well, in that case I need to buy a lot of batteries D: I should build like 7-8 packs of 4x2500mah 3.6v right?


#10

How many volts and mah do you want? I will design a configuration for you. Volts must be at or above 22.2v. What cells will you use? Samsung? LG? Sanyo?


#11

If I can achive around 10km range with 5000mah it would be enought for me

On my local amazon I can get a good deal on this
Samsung ICR18650-26F Li-Ion 18650 3.7V 2600 mAh

Otherwise I can get the samsung 25r or the lg LG HE4 18650 2500mAh 20A 3.7v


#12

You could probably get that with 8S but do you want a higher voltage so you can go a bit faster?


#13

I don’t now how fast I can go with 22v, I’ve seen that the standard speed with 1 motor is 25-30km/h, I won’t need go any faster than that…also I’m only 60kg


#14

The speed also depends on the motor kv. Well, here is an 8s pack design I did for you. If you wanted to go less just take or add on a group of cells.

You would also put balance leads on the positive, negative and series connections.


#15

@lox897 I think this design is more like 4s4p in my opinion, as I can only see big groups of 4 batteries connected in series and each of this group of big batteries is 4 cells in the inside. Correct me if I am wrong.


#16

No. There are two cells that are connected in parallel and then in series. Same happens on the outer area of the cells.


#17

It’s like @whitepony 's design except smaller and not 4p.


#18

Ohh yes my bad the two cells are connected in series. you’re right :smiley:


#19

I see how you got confused though. It looks a bit confusing.


#20

Thank you very much :slight_smile:

Now I have to decide If I want to spend around 150€ and build that pack or wait a bit and get di space cell…
In the meantime I could buy like 3 of these http://www.hobbyking.com/hobbyking/store/__14076__ZIPPY_Flightmax_1800mAh_9_9V_5C_LiFePo4_TX_Pack.html
and put them in series to get 30v just for trying the esk8