Feedback request for these blue Lipo batteries

Depends on how many amps you plan on running, 5000mah = 5 ah + 25C = constant draw of 110A with short bursts to 220A.

Don't think you'll get much range off RC packs though, they're meant for high draw for only a few minutes.
 
I was thinking the same. Would the RC batteries be any good to power my 36V 500Watt motor?

500watt.JPG


I'd like to buy lightweight batteries that I could use to power my motor, then when I can afford all the RC stuff thats needed for my bike I could use the same batteries once I change on to an RC motor.

Regards
Tom
 
Kevlarr said:
Depends on how many amps you plan on running, 5000mah = 5 ah + 25C = constant draw of 110A with short bursts to 220A.

Don't think you'll get much range off RC packs though, they're meant for high draw for only a few minutes.
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It depends on what your controller pulls, not what the battery is capable of.
 
Kevlarr said:
Depends on how many amps you plan on running, 5000mah = 5 ah + 25C = constant draw of 110A with short bursts to 220A.

Don't think you'll get much range off RC packs though, they're meant for high draw for only a few minutes.
Click to expand...

BossCat said:
Well my controller is this one....

36V up to 800Wattt
36V 800W YK31C Electric Scooter LBD14 Controller 038 on eBay (end time 01-Oct-10 16:36:31 BST)

Regards
Tom
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That's a 25a controller.... (normal for a standard controller).. And that's max usage (takeoff from a dead start).. More than likely, the average amperage you'll use is somewhere around the 8 to 12 amp while riding.
That's 36v 10a on avg.
So figure at that usage, compare it to the batteries your using...

I have a 15ah LiFePo4 36v battery and I use on avg about 12a continuous... And I get a Max distance of 21miles at 18mph.
 
Listen to Thud he knows what hes talkin bout! Both of us use the packs hes linked too, heres mine in assembled using GGoodrum parallel adapter boards available from tppacks.com

44v_20ah_lipo_pack.jpg


44v 20ah pack!


Capable of 300amp bursts have never even got slightly warm...BEST bang for buck pack around today. The weight of my entire
pack including boards is lighter than a 12v 20ah SLA lead battery!

KiM
 
Thanks for the info Thud and Kim. These batteries look way complicated with all those mass of wires and other bits to contend with....zpt

Regards
Tom
 
Actually they're not that bad, all the extra wires/connectors are for are the cell balancer, the important ones are always red and black. :D
 
Exactly, want complicated look inside one of those duct tape Lifep04 pack.

Balance taps on Lipos are hardly used if you dont dischagre below 80% as lipos stay very well balanced as a rule. When out of whack those wires connect straight into any standard rc charger/balance the connectors used are an industry standard.

KiM
 
Wanna see complicated have a looksee at a Lifep04 setup with all its balance wires flooping about everywhere LoL...

KiM
 
Shows how long I've been out of the electric plane scene, none of my lipos have balance taps and neither of my two chargers have balance capabilities. rotfl
 
Kevlarr said:
Shows how long I've been out of the electric plane scene, none of my lipos have balance taps and neither of my two chargers have balance capabilities. rotfl
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I think you might have either nicads or nimh as all lithium polymer packs have balance taps the older lipos from 2-3 years back were very volatile if they were overcharged, big bang and very hot fires... Lipos have to stay under 4.2v per cell and above 3v Todays lipos are extremely forgiving needing near 3v over charge before releasing magic smoke and flames...I personally have over charged ~12 packs myself to 5v alot of puffing no bang, i have pierced these packs re-sealed and they are performing and staying balanced as per new, this would of been unheard of if not impossible only few years ago. WARNING:- That said...i don't wan't people following my lead on this if you do, do so at your own risk if it goes wrong you will have a lot of smoke and very very hot fire you wont be able to put out easily...

KiM
 
Thud said:
You wont find a better battery than Lipo for energy density & c-rate in discharg or re-charge. I can't say its the future. But it is so much better than lead there is no comparison fo bicycle applications.

20 AH is 20 Ah....doesn't matter if its rc or not.
I run these on my bikes:
HobbyKing Online R/C Hobby Store : Turnigy 5000mAh 5S 25C Lipo Pack
with shipping they average like $75 per pack.
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Hiya Thud,
Thanks for link and info on these batts m8. Iv'e just been told that I have some work coming up next week, so I'll be able to afford a couple of these Turnigy 5000mAh 5S 25C Lipo Packs to run my 36V 500Watt motor with. Can you also recommend a charger for these batts?

Regrads
Tom
 
really thank you for the links, im building an electric drag scooter myself, the job has been long and teadious, im getting very excited about it. i havent decided about the batteries yet...

im startin off with the same motor for testing which is a 36volt 500watt, then going to a 48volt 1000watt e motor... heres a link to the fastest so far, 93mph in an 1/8 mile run, 48 volt mega watt...

Silver Giant Electric Dragbike

and a pic of my project...
 

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Can you also recommend a charger for these batts?
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if you go to the "BATTERIES/CHARGERS" section of hobbyking & look up the iCharger 1010b+ lipo charger. It will safely charge anything on the planet & I even use it to power my home anodising set up. it requires an additional 12-15volt power supply but it is a really functional pc of equipment worth every penny.

2nd recomdation would be the lower dollar iCharger 206b.
this stuff has been bullit proof for my money & i have them & stll use the ballancing functions often.

*through the looking glass*
(off the record & not recomending...I fast charge my cells with modified Meanwell power supplies. providing CC charging at 10+ amps. I go from dead to "ready 2 race" in less than an hour on a 44v-30ah pack)
If your willing to get educated on safely handling this battery chemistry, I will link you to information on modifying powersupplies, & some additional products that will get you way out on the cutting edge of EV technoigy......none of this stuff is plug & play & really for a die hard enthusiest at this time.
look up meanwell s-350 on e-bay & read this:
Endless-sphere.com • View topic - Switch mode supply mod
once you understand all that look at this:
Endless-sphere.com • View topic - Fechter's Mini Meanwell Limiter Board
There are all sorts of boards & chaining of cell kits to help manage your battery for max life span & performance from this guy also.
Products

thats enough info for now. good luck & be careful boyz...remember its on you to fully understand what your working with, the limitations, & you own abilities.
For me, Life is much better near the edge.
 
Thud, if I can tap into your knowledge. I have a eZee 400W/36V hub motor wheel mounted on my sidecar and now the best battery question has come up and you and KIM are having a world of luck with Hobby King and I try never to tamper with success.
Do these batteries need a battery management system installed? If so who do you recommend?
How many batteries should I purchase. Sorry, I guess these pretty basic questions but the change from gas to electric hasn't been as easy as I had hoped.

Steve.
 
Hey Steve,
The short (dangerous) answer is no.
But in reality on anything like this you need at least a quality monitering system. & make good decisions when the gages tell you need to stop. A high qualty BMS will do all that for you by shutting down when the operating parameters are exceeded.
I ride "cowboy" style with simple battery alarms that go off if a cell trips a programed low voltage piont.
HobbyKing Online R/C Hobby Store : BM-6 Cell Voltage Monitor 2-6S Lipo (New Version))
I do all my charging & battery maintance on the bench. 99% of my riding is on a track in the back yard or in a parking lot on suday mornings & batteries rarely see 50% discharge levels.

What are you running for batteries now? If its time to replace or upgrade then defiantly look at Lipo.
KIm has a far more advanced Managment system on his cruser, I will let him elaborate on his specifics of his set up.

I would think 20Ah would be a starting point (10cells 4parrallel thats) 8-5cell 5000mah packs 2 packs in series & then the 4 groups parraleled for capacity.
chargers, & the like are many, & in every price range.

if your struggling with any e-bike issues, the greatest knowledge base is definatly ES. A good guy to read is "Dogman" a resident equipment tester & critic. He gives good advice with insight & experiance & he has just made the transition to Lipo over LiFe ping packs I think. (at least on his race bike)

here are a couple threads any E-biker thinking Lipo should read:
Endless-sphere.com • View topic - LiPo battery care and basic information
do pm dogman & ask specific questions. He has allways been helpfull to those in need. & frequents this forum also. good guy.
Endless-sphere.com • View topic - Dogmans racing bike
don't know f this is any help. Good luck.
 
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