DIY - 1st Build Project (Battery Charger)

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1

G’day all

I finally got hands on my juice box. It is a 10S5P 36V 15000mAh.

My question now is what sort of charger should I get. I have seen lots of 42V 4A chargers.

I am not fancy about fast charging, my priorities are good care of the battery.

Would appreciate any help in this matter.

Thanks in advance

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Charger voltage:
10s makes 10*4.2v=42v, which means you need a 42V charger.
4.2v is maximum charge of some li-ion battery when its fully charged.
Some are 4.1v, but you gotta check the sepc.

Charger current:
Find out the current of one cell and multiple it by 5, because of your 5p. (when all the cells are the same)

For example if you have a 1.5A cell, and you are 5p, then you need a 7.5A (5*1.5A) charger.
Going below 7.5A makes charging process longer.
Going above 7.5A makes it fast charge (if the cells are capable).

BMS current:
The current you calculated and the current that BMS can handle could be different.
It depends on the BMS how much current it can handle, you gotta check the max-charge-current
For example if you calculated that you need 7.5A charger but your BMS is 5A, then go for the 5A.
It is recommended that even go for below 5A.

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I mean, he said he’s cool with a slow charger. A 4a charger should juice the pack in 4 hours. A 42v 4a charger is plenty sufficient.

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What’s her name?

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First name juice last name box

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At 5P, a 4A charger isn’t a “fast” charger despite what sellers claim. It’d be a super-fast charger at 1P or a fast charger at 2P. At 5P, it’s technically a slow charger.

That being said, I also prefer a 2A charger because if you don’t need it charged faster, why put extra wear on the cells? Especially if you have more than 1 skate or don’t skate that often or far.

Evolve used to sell a really good one, but they no longer do. It was my favorite, you may be able to find the old Evolve “2A” charger used somewhere.

Metroboard has one that isn’t as good as that one was

If you want a 4A version, Metroboard has the best 4A imho, and it’s the same one Evolve sells and the same one enertion used to sell.

Another 2A variant that’s good (but takes 2 months to ship) is the YZPower 42V 2A charger with the 5.5mm x 2.1mm plug.

Note that “10S 36V” means 42V, and these are all 42V chargers.

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I own 2 of those and also noticed it looks similar with the evolve one.

I only measure 3 amps of current though when charging with these.

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I have 5 of those chargers. They have no fan, are nice and small and the best power per money for passive chargers I could find. Depending on how fast I want to charge I just plug them in in parallel with a diode and fuse. The diode also makes me not charge it all the way to 100% for better battery life.
There is also a 10s version of this charger

Another way of charging I like are DCDC step up converters with CC CV functionality. You can use an old DC power supply from a pc or something and then charge to every voltage you want. I use this one to charge everything from 8s to 20s and can exactly Control the voltage and current I want.

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its really that slow to the US? :eyes:

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Let me guess, it’s a week for you?

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fastest i’ve got from YZpower is like 4.5days, slowest was 10days :joy:

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Sometimes it’s slower actually

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If I have to wait 2 months for something, I would probably forget about it until it suddenly shows up at the door

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That’s exactly how it goes down

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Thanks mate… ended up ordering the YZPower 42V 2A… they say it will get here in three weeks… let hope it does.

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