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Make a 1S LiPo Batteries charging cable
#1
[Image: 0IWiCCwl.jpg]

I have been using a simple charging cable that simply connects all 1S batteries in parallel as one big 1S pack. This way is very slow and requires all packs to have very close voltage. 

Here I will show you how I made a charging cable that can allow me to charge the 1S lipo much faster.

Depending on how many lipos you want to charge per turn, as an example, I want to charge 4 packs every time, so I use 4 connectors on my cable. With this cable, I will be able to charge the Batteries as one single pack of 4S Lipo. 

You can also use 5 connectors and make it a 5S, or 6 connectors as a 6S if you charger support charging this high voltage. It only means you can charge more batteries at the same time.

Instead of connecting the packs in parallel, we connect them in series, and the cable wiring basically looks like this.


[Image: Lipo-cells-connection-anode-cathode-terminals.jpg]

However, the batteries have to be the same type, same brand, same capacity. You might be able to get away from these, but It's not safe. As for voltages, a few times some of the packs voltages were quite far apart like 3.4V and 3.7V but it charged just fine. I heard some chargers don't charge if cell voltages are too far apart so just bear in mind. However charging will take longer if the cells voltages are too different, because it takes time to balance them internally. Therefore always charge lipos at similar voltage level.

When charging, just select "Balance Charge" on your charger (it should require the big discharge lead and balance plug)

Also I wouldn't recommend charging it exceeding 1C. For example i have 4 x 200mAh 1S, when connected with the cable they become a single 200mAh 4S. So I would want to charge it at 0.2A current.

I am using 2 different types of connector for each branch Smile
So it can work with Tiny whoop batteries ( Pico blade) as well as the Lossi connectors.

(Both XT60 and 4S balance plug are recycled from a dead 4S lipo)

[Image: PAyzxSrl.jpg]

[Image: nJpOwWzl.jpg]

[Image: tqVN4pxl.jpg]


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[-] The following 4 users Like Oscar's post:
  • smitty2919, brnmd, oyvinla, sloscotty
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#2
Great idea, Oscar! I've got ton's of balance leads (3s, 4s, 5s, 6s) - now just gotta get the charging connectors for the 1s.
[-] The following 1 user Likes sloscotty's post:
  • Oscar
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#3
Oscar, you mentioned that charging takes a lot of time when connecting them in parallel. Can't you just boost up the charging rate on your charger? 4x200mah=0.8mAh so if you charge with 0.8A it will still equal 1C charging on each battery (if we dont care about that batteries with less internal resistance, could soak up more current in sorter periods which is the downside with parallel charging)

you should try to make a 6S and connect it to your microquad. That should speed it up quite a bit Tongue
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#4
(07-Sep-2016, 12:53 PM)oyvinla Wrote: Oscar, you mentioned that charging takes a lot of time when connecting them in parallel. Can't you just boost up the charging rate on your charger? 4x200mah=0.8mAh so if you charge with 0.8A it will still equal 1C charging on each battery (if we dont care about that batteries with less internal resistance, could soak up more current in sorter periods which is the downside with parallel charging)

you should try to make a 6S and connect it to your microquad. That should speed it up quite a bit Tongue

not really Smile
when charging them in parallel, for some reason it limits itself to 0.3-0.5A even though i set the current to 1A when I have 4 packs connected Smile it's a smart charger LOL 
And I notice the voltage jump right up to 4.2V as well (it will drop right back down when you stop charging) maybe that's why the charger decides to slow down the charging as the packs simply can't take the power.
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#5
(07-Sep-2016, 01:09 PM)Oscar Wrote: not really Smile
when charging them in parallel, for some reason it limits itself to 0.3-0.5A even though i set the current to 1A when I have 4 packs connected Smile it's a smart charger LOL 
And I notice the voltage jump right up to 4.2V as well (it will drop right back down when you stop charging) maybe that's why the charger decides to slow down the charging as the packs simply can't take the power.

I see, I got the same problem when trying to charge single 18650 batteries with my charger, so I guess the internal resistance is quite high in those cells. I will try charging them in series instead like you did here and see if I can charge them a bit faster.
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#6
If there is some animo and i have some time i can make a PCB for it and make a kit for it so can solder it by your own.
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#7
(07-Sep-2016, 06:30 PM)Ikkuh Wrote: If there is some animo and i have some time i can make a PCB for it and make a kit for it so can solder it by your own.

I am sure there will be demand Smile
it's takes at least an hour to DIY your own ! I don't know why BG isn't selling this already.
Don't be a LOS'er, be an FPV'er :)  My Gear - Facebook - Instagram - Twitter
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#8
I think series charging is correct way. I destroyed 6pcs Nanotechs and made them Nano-puff.. I did not exceed 1C charging/cell on parallel charging, but found out that internal resistances got different. That time didn't have balanced charging harness and batteries dies.

Later on, I bought another 6pcs and made balancing series charging and harness,so far no problems or sign of puffing.
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#9
(07-Sep-2016, 07:43 PM)Oscar Wrote: I am sure there will be demand Smile
it's takes at least an hour to DIY your own ! I don't know why BG isn't selling this already.

I used this one for the last 2 month, works great. You can just add 3 of those small batteries and connect the "Main Power" and the balance lead to any LiPo Charger and charge it as a 3S pack.


http://www.banggood.com/Wholesale-Balanc...51891.html
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#10
So there is a 3S wire solution, is there still interest in a variable 1-6S PCB solution?
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#11
Thank you for instructions.
Is it to charge 2 550mah and 2 300mah as 4s pack at 0.3A?
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#12
(14-Mar-2019, 04:33 AM)sim_tcr Wrote: Thank you for instructions.
Is it to charge 2 550mah and 2 300mah as 4s pack at 0.3A?

Oscar harness is connecting the packs in series. It is not advisable to mix capacity in series both for charging and discharging. The small capacity packs will be fully charged with higher voltage while the larger packs will not. This puts the smaller packs to be overcharged when the larger packs gets fully charge. Therefore risking and likely cause a fire.

I think what you are referring to is parallel charging. Where the voltage a across all the lipos are the same. In parallel charging, you can have mixed capacities.
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#13
I was looking for a solution to charge my whoop LiPos faster, or at least more than one at the time, and I really regret not having that 6-way 1S charger...
I think I can pull this off as soon as I get some of those ph2.0 connectors Smile
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#14
Hi Oscar,
Thank for All your work, i just started to look into this World a month ago and it really helps (and kill me at the same time lol) !

I'd like to try doing this cable to charge 4 1S LiPo.
Could you give me a more detailed picture of how you soldered all the cables - Xt60 connector and balance lead please ?

I don't want to do any mistake and it's still a bit confusing

Thanks again
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#15
Would it not be easier and maybe safer to use a charger designed for this? I have been using this charger for well over a year and it works great. You can do different capacity batteries at different charge levels as the channels are independent. It charges six batteries at up to a 1 amp charge rate.
https://www.racedayquads.com/products/ul...by%20type)
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