Turnigy 4500mAh 6S2P 30C LiFePo4 Pack??

etard

etard

100 kW
Joined
Aug 3, 2008
Messages
1,936
Location
Redlands, CA
Hi all, any help here would be great! I am about to pull the trigger on some batteries that I will be carrying in a backpack so I am trying to stay away from the LiPos ATM. I will be using a backpack converted so that I can quickly release the battery compartment in one quick motion, or in the case of an accident the battey will release with the tether connecting them to the controller on the bike and I can safely tumble to a stop ( or thud) at the side of the road. :lol: Anyway, I will be charging with a Meanwell power supply with some MWKeefer mods @ 44 volts. I am planning on having 6 of these batteries for about 13AH. They will be run to a CC HV110.

My question is: Should I stick with the same chemistry everyone else seems to be using (LiPo) cuz I am an electrical noob, or will these LiFePo4 batteries act the same yet be a lil safer considering my mounting location? Has anybody used these? Pic:

T4500-6-30-1.jpg
 
I'm curious about how those cells perform also. I incorrectly assumed they were a123 m1 cells at first..

CellMan is going to offer built m1 packs soon, so that is another option if these don't live up to claims. I thought somebody tested them and said the C rate is overstated but I could be remembering wrong.
 
Seems like I remember somebody saying that too, but I don't recall what thread or who. Will they be good enough, most likely, with 3packs in paralell you'd theoretically have 300 amps avalialbe. Surely with a 10 ah or larger pack cutting the c rate in half leaves you with plenty to play with, like 150 amps.

I was tempted to try those too, but the price made me just go for the lipo.
 
So it's a resounding Hmmmmm. :? :?

Looks like I'll have to get on rc groups and do some thread searching. After being on ES and then off to other forums, I have to say that the search here is one of the best out there. Dogman, to answer your question, no I will be pushing anything over 100 amps with the Fechter box and HV110 so these batteries should be seeing a modest 4 kw. Haha, it's funny saying that, but when I first got here, that much power was INSANE!!! :shock:

I guess my next question would be concerning the balancing nature of these packs. I am wondering if the 6s2p bricks will be tough to string together. Apologize if this is obvious but will I have to add a battery medic to each brick or tear into them? :idea: Or, can I make a complete 12s brick out of the one and just string this together? Hmmmm.... Be back
 
They're not A123 cells AFAIK. They are a pouch cell, I've seen a few comments about them, best to have a look around.

As was mentioned above I will be offering assembled A123 M1 packs or subpacks in the near future, within about 1-2 weeks. The M1 cells can take some serious abuse in their stride.
 
Hey Cellman, thanks for posting, can you give me a link to the new cell thread? I remember you were gonna have to find a supplier on the cnstant, so it looks like you have. :mrgreen: I would much rather hand my hard earned dollars over to a reputable boardmember than a giant conglomrite. Especially if you provide a secure mounting style. Please point me to the page. :D
 
Bro,

1.) A tether release on impact is a poor idea (for the batteries, the throttle release is fine if you wish)... you would be better served finding a suitable piece of tupperware, adding foam all around and sealing it with duct tape then putting 2 of those in your back pack...

Lets be honest, if your in a smash up hard enough to impact the batteries through all that... well the batteries are the least of your worries...

Really wanna feel safe - stitch in (or glue on) a lipo bag into the inside of your backpack between your back and the pack... that will protect you for the 2 seconds it will take you to remove it :)

2.) For the time being - considering this is your first forray into this adventure of high rate lithium chemistry... stick with some known LiPos... Granted I don't crash but, I've got packs here that look as if they should have blown up long ago - but haven't {yet}... and I routinely carry a spare 1P pack in a backpack or messenger bag while I ride, just for safety (especially when riding with my kid).

That's my .02... with regards to will it work, sure it should :)

-Mike
 
etard said:
Hey Cellman, thanks for posting, can you give me a link to the new cell thread? I remember you were gonna have to find a supplier on the cnstant, so it looks like you have. :mrgreen: I would much rather hand my hard earned dollars over to a reputable boardmember than a giant conglomrite. Especially if you provide a secure mounting style. Please point me to the page. :D
Click to expand...

My pleasure Etard :)
below is a link to a thread I started here in the battery section and I have also started a for sale thread.
http://endless-sphere.com/forums/viewtopic.php?f=14&t=19627

The cells are currently being tested and I'm sorting out a spot welder ASAP. I promise my prices will be as good as you can get for new A123 M1 cells and I will do my best to get the assembly as required. I'm thinking that small groups of paralleled cells, spot welded together, which can be joined together as required will work for those that want a more DIY approach but will also offer a more complete package. It's gonna be a week or 2 before I have something ready for sale.
 
I use 2 of the 2S2P packs on my motorcycle, works perfect.

The bike is a GPZ 500 cc, so I think it pulls 100 A in the few seconds it takes to start the bike. I have used the battery fore the last 2 months. The battery stays in balance, but I don't use more than 1/10 of it's capasity when I start the bike.

A 4S1P pack of A123 M1 cells starts the bike fine too, but I think the Turnigy pack turns the engine over a little faster.
 
etard said:
I will be pushing anything over 100 amps with the Fechter box and HV110 so these batteries should be seeing a modest 4 kw. Haha, it's funny saying that, but when I first got here, that much power was INSANE!!! :shock:
Click to expand...


I had same setup and regularly saw 5500watt on the Turnigy meter.
Replaced the HV110 with the HV160 data logger posted 9555watts
240amp peak current reading Lipos sagged 7v.

Go lipo and you will never go back.

KiM
 
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