Universal charger? Li-Mn/Lifepo4
- Thread starter tdneVmoDK
- Start date
dogman dan
1 PW
Generally no. Generic chargers can be set to one voltage. Three different cheap chargers would of course do all three.
RC chargers might come the closest to being a universal charger. But to get that particular combination of voltages, you might need two, each able to do 24v, or get the biggest type, like the hyperion 14s. That one would charge and balance up to 48v lipo, but ony about 43v in lifepo4. 48v lifepo4 is 16s.
Can't even begin to recomend a bms till you tell us what chemistry. for lifepo4, signalab bms is common. Opinons vary on thier quality. Like a charger or anything else, any bms is only as good as it's worst component. So blindly trusing a bms is fairly unwise. BMS + manual monitoring for the win.
RC chargers might come the closest to being a universal charger. But to get that particular combination of voltages, you might need two, each able to do 24v, or get the biggest type, like the hyperion 14s. That one would charge and balance up to 48v lipo, but ony about 43v in lifepo4. 48v lifepo4 is 16s.
Can't even begin to recomend a bms till you tell us what chemistry. for lifepo4, signalab bms is common. Opinons vary on thier quality. Like a charger or anything else, any bms is only as good as it's worst component. So blindly trusing a bms is fairly unwise. BMS + manual monitoring for the win.
dogman dan
1 PW
Nice numbers, but if anybody else is wondering what chemistry, we stil don't know. Laptop cells? Guessing, one is lifepo4, the other lico?
If you are heading for 16s, then two 8s RC chargers is one way. All the just a charger stuff I know of is just a one voltage too. They aren't that high priced, so just buy one in each voltage.
Bear in mind though, a lico 36v, a lead 36v, and a lifepo4 36v, may all have different "36v" settings. BMS battery will set one to your spec though. So some are truning to those for lico bulk charging.
If you are heading for 16s, then two 8s RC chargers is one way. All the just a charger stuff I know of is just a one voltage too. They aren't that high priced, so just buy one in each voltage.
Bear in mind though, a lico 36v, a lead 36v, and a lifepo4 36v, may all have different "36v" settings. BMS battery will set one to your spec though. So some are truning to those for lico bulk charging.
dogman said:
I think the 3.7 is also safe chemistry:
http://budgetlightforum.com/node/11902
I don't think you would put Lico in a drilling machine.
I don't know what 6s or 8s means, but i think i am going to buil a pack with 48 volts and about 6 Ah. or 36 volts and 8 Ah. That should give me a little less than a 2 C discharge rate when i max out the bike with a 500W motor. I just need a BMS for the pack so i can see all voltages, and have some kind of cut off funtion.
docnjoj
1 GW
4S is 4 cells in series; 8S is eight cellsin series. 4P is 4 cells in parallel. The charge voltage would be different for LiFePO4 and LiCo. Generally LifePO4 is 3.65 volts per cell and hobby Lico is about 4.15.
otherDoc
otherDoc
dogman dan
1 PW
Well that's progress, Li-mn. So the common ping bms would not fit it.
Now if you ask in another thread, or retiltle this one, folks who are expert with li-mn can know to open and read it. I'm ignorant in that chemistry. If I had some, I'd use my RC chargers to charge it since I have them.
Sorry about the jargon, I post too much here to keep track of every individuals level of expertise. Battery FAQ's will make excellent reading to pick up the jargon.
Now if you ask in another thread, or retiltle this one, folks who are expert with li-mn can know to open and read it. I'm ignorant in that chemistry. If I had some, I'd use my RC chargers to charge it since I have them.
Sorry about the jargon, I post too much here to keep track of every individuals level of expertise. Battery FAQ's will make excellent reading to pick up the jargon.
docnjoj
1 GW
I believe these cells LiMnCo are similar to the Sony V and VT. Charge to 4.1 per cell. That is what I do with my Fatpacks.Of course the real question is "Do they self balance?" I dunno.
otherDoc
otherDoc
docnjoj said:
Self balancing cells? Do they exist?
I am actually more interested in the green lifepo4 US18650 ones.
I have now charged 10 packs of 5 x US18650FT from either dead 0V or bear to 3.3 volts. I am simply connecting the two packs in parallel to my LAB charger, starting out with about 0.2 amps and then after the cells reaches 2.5 i give it something around 1A to get a 0.5C charge.
I'm charging them at 0.5 C for over an hour, and they can still take plenty of charge, so there should be some capacity in them I would guess?
The first thing i do, is that i take the voltage, devide it by five, and then i measure two different cells. If they are 1/5 voltage, then i am good. I have had one pack that started getting a little hot on one of the cells and wouldn't charge properly, and one pack that would not charge at all.
I hope they will work, or else i am wasting my time
I'm waiting for my Sky Rc iMax B6 balancer, so i can see how much capacity is left in some of the cells, and if they are good, i will put them on my ebike
docnjoj
1 GW
http://endless-sphere.com/forums/viewtopic.php?f=14&t=36324
otherDoc
otherDoc
docnjoj
1 GW
Hopefully that link went to some self balancing lithium cells like Sony V and VT. I'll recheck.tdneVmoDK said:
otherDoc
Edit: Yep it is the latest discussion on Konions (Sony V and VT) There are a lot of older threads on these cells.
docnjoj
1 GW
What am i looking for?[/quote]
Hopefully that link went to some self balancing lithium cells like Sony V and VT. I'll recheck.
otherDoc
Edit: Yep it is the latest discussion on Konions (Sony V and VT) There are a lot of older threads on these cells.[/quote]
How should they be able to balance them selves in a series connection?[/quote]
Apparently their internal chemistry is such that if they start out well balanced they wil continue to balance (within limits) Definately do a Google search for Sony V and VT cells and Makita lithium packs as well as Fatpacks.
otherDoc
Hopefully that link went to some self balancing lithium cells like Sony V and VT. I'll recheck.
otherDoc
Edit: Yep it is the latest discussion on Konions (Sony V and VT) There are a lot of older threads on these cells.[/quote]
How should they be able to balance them selves in a series connection?[/quote]
Apparently their internal chemistry is such that if they start out well balanced they wil continue to balance (within limits) Definately do a Google search for Sony V and VT cells and Makita lithium packs as well as Fatpacks.
otherDoc
