Duct Tape E-Bay Lifepo4s???

[Malenfant]

Salut!
I´m realy sorry bikerider, but i´m not french, i´m german and my french is even worse than my english :? .
Plus i should have told you guys what battery i´ll get: a 48v/20ah.
What i want now are two separate 48v Packs with 10ah. You know, i don´t need to commute that far. My work is just 7,2km away from my house so the 20ah would be just unnecessary weight. On the other side it would be nice to have a big battery for the sunday-tour. So it would be perfect if i could join the two batteries back together if it´s necesarry. Is that possible?

Thx for all you help
Marc

 

[chessir]

has anyone got experience with missbattery at ebay? Does she deliver? If so please let us know your experience with missbattery.

 

[electricridefl]

Hi all,
I don't get much time to come here, I wanted to update the history of my ping 72v5ah battery I've been using for my commute....no bms...no amp cutoff of any sort....so the 1st day was spectacular...rode 5 miles to work, connected the 36v halves together and charge with ping charger, 1.5a, 46.4volts, the light is red then goes green, and voltage stays at 46.4v...Well that was the first day...next day, on the ride home, I felt a slight loss of power, I get home and measure the halves, upper is 40.4v, lower is 37.6v, so then I parallel charge again, then batteries sit for over a day, then I check voltage, 42.4 and 40.4. Now when I made the battery, I left some of the bms wires on, and let some poke out of the tape, and so there were only 2 wires, and on the lower battery, and so I could check voltage of first 3 cells, the last cell, and the total of the ones in between, so I make chart of cumulitive voltage total counting up to 12 cells, with columns for 3v, 3-2v, 3-2v, 3.4v, 3.5, 3.6, so then I could see that all the cells in the lower battery were equal, except for that last cell, the only one I could measure individually, so I charged it separately, and also, I charged the individual halves separately, so after the parallel charge after friday trip home, and also I left the charger on for several hours after done, and then when charge separate, the lower half charged for hours.
So I am not comfortable charging in parallel...So I charged the one cell, sometimes reach 4.2v, and then charge the half...and then ride today, and charge in parallel, as that was my only option today, and then bike ran ok, ride home was 30mph headwind, and so I kept the throttle maxed for much of the trip, and then get home and measure, each battery half at 39.6v, and check cells in lower battery, and each is 3.3v, even the odd one that I didn't know if it was damaged, but seems fine today, so although I left these batteries for several hours with green light on charger, it did not seem to help to balance a weaker cell, but these cells have proved durable and safe so far, no bms, 4c discharge, Here is pic of bms and battery...whew...I'm so glad no cell is ruined...yet...View attachment 1
and also, when I charge with 36v sla charger, it doesn't get full, and after charger switches to float...well just weird...now I have 2 extra 36v10ah batteries left over...Oh, Ive gotten almost all my problems fixed, a good rear tire, lights, fenders, and my spokes are fine...but now my only annoyance is when I shift into top gear, 11t, and then the chain skips on the sprocket sometimes...what is wrong? Is my cable binding up?

 

[electricridefl]

Oh and the black terminal is due to checking voltage, but of course not unplugging the probe from the voltmeter from the amps setting...that happens to me everytime...

 

[Freddyflatfoot]

missbattery is the Ebay seller for Yesa batteries.
I have a 24v/10Ah Yesa battery, and although it is only a 1C battery, it has been a very good battery. Support from Yesa has also been good.

 

[cerewa]

has anyone got experience with missbattery at ebay? Does she deliver? If so please let us know your experience with missbattery.

Missbattery on Ebay is a salesperson for YESA ( http://www.yesa.com.hk ). I bought my battery from YESA/missbattery on e-bay and I'm very happy with it. Shipping was prompt and the battery, charger, and BMS all seem to be good quality. The YESA packs (like packs from some other companies) come with the BMS exposed /in plain view so I recommend you do put something over it. You can even tape some of the foam padding they ship the battery in over the BMS to protect it. Ping's packs look like the better deal now though (more capacity for the same price)

What i want now are two separate 48v Packs with 10ah.

Mark- This won't work. The 20Ah packs are made out of individual 20Ah cells which can't be split (at least I'm pretty sure they are 20ah cells. You can ask the seller whether they are in fact using 10Ah cells in parallel to make 20ah but they probably aren't).

In other words you can divide the pack into two 24V packs but you can't divide it into two 48V packs.

If the 48V pack is made out of 10Ah cells and you're able to come up with over-amperage and under-voltage protection then you can split it.

 

[Link]

Mark- This won't work. The 20Ah packs are made out of individual 20Ah cells which can't be split (at least I'm pretty sure they are 20ah cells. You can ask the seller whether they are in fact using 10Ah cells in parallel to make 20ah but they probably aren't).

The Ping or YESA packs? The Ping packs are made of 2.5Ah cells, if I remember correctly.

 

[geoff57]

hi all
on pings 48v 20ah batteries they are made of four 5ah cells linked then in series 16 times splitting it into two 48v 10ah is possable but not pratical.first the whole pack would need dissasembimg so you are left with 64 cells you would then need to rebuild the cells into two 48v 10 ah batteries You would have to use a diffrent bms as the one you get is for 20 ah and high current could damage the packs but the bms would not pick up on this as it is designed to protect a bigger pack. finally remember a 10ah pack will start to complain at over 10 amp draw

 

[geoff57]

Hi Geoff57,

Same conclusion for me i'm just a bit late loll!

Good post from you
Bikeraider

hi bikeraider
thanks for the praise.
I have split my 48v 20ah into two packs with extended bms wires so the battery could be half on side of the rear wheel half on the other I have a recumbent and need to keep the centre of gravity as low as possable, the last thing you want at 25mph in traffic is to flip over because you put your battery on your rack which is higher off the ground than your head !

I do have plans to add a 24v 20ah pack to the setup to make it up to 72v 20ah but this will require a bit of thought, I think putting the packs in serise with the on off switch between them, then use the bms boards for charging and a separate lvc board for discharge.

Can somone put pings shop web address on here I'm on an iPhone for 10 days and pings shop page is only on my computer at home

 

[geoff57]

hi all
the pack would not be above my head just higher upabout a foot behind my head.

have you got bob and garys web site or email address

 

[mcstar]

...but now my only annoyance is when I shift into top gear, 11t, and then the chain skips on the sprocket sometimes...what is wrong? Is my cable binding up?

Not sure if this will help you, but I too had a skipping chain. This is the pedal chain on my bike. The electric goes to a front hub motor. At first it only happened at load in the highest gear (when I was pushing real hard up hills at about 23mph+). Eventually it happened all the time, in every gear. It turns out one link in the chain had streched and was no longer meshing up with the sprokets correctly. The bike shop mechanic found it quickly and replaced the chain. For daily riders he said chains only have about 1000 miles before they usually need to be replaced.

 

[Freddyflatfoot]

Skipping chains can also be caused by mis-aligned rear derailleurs. Usually happens as the cable stretches a bit. May also be a problem with the high gear stop, or a bent derailleur hanger. Either way, a trip to your LBS for a service should get it all sorted.

 

[petranator]

Hey there,

Any Anna customers out there who can help me, much appreciated.

I have a 36v/20ah pack that just arrived. It's got 3 wires coming out of it. I'm pretty sure I know what the red and black ones are for. Just wondering what the lighter green one is used for? Is this some sort of ground or does it have something do to with the charging? (ie. what should I do with it?)

Thanks!

P.S. As others have reported here, I was sent a 48v charger rather than the 36v I require. I am awaiting a reply concerning replacement. If anyone is aware of a cheap solution that could be obtained readily, please PM me.

 

[kyakdiver]

Red to positive on charger and little guy to neg on charger... If' i'm wrong i didn't approve this message. 8)

 

[Freddyflatfoot]

Check back a few pages on wiring up a Ping pack, should be the same. the light green one should be -Neg charge wire. Red is common +Pos for both charge and discharge, and the Black should be your -neg discharge wire. Hope this helps. BTW, didn't you get any written material/instructions from Anna?
If not, very poor service! At least Ping seems to provide better support for his product.

 

[mazott]

Hey there,
P.S. As others have reported here, I was sent a 48v charger rather than the 36v I require. I am awaiting a reply concerning replacement. If anyone is aware of a cheap solution that could be obtained readily, please PM me.

Never ever use any other different charger that is not specifically suitable for LiFePO4, unless you know exactly what you are doing.

 

[mazott]

Has anyone got any indication so far about the capacity percentage of energy obtainable from the duct tape batteries at 1C/2C?

 

[karma]

sure if it ever stops snowing

 

[rumped6]

Following someone's advice posted about a week ago to email Li Ping directly, I did, three days ago,
asking "buy-it-now" prices for 36v with 10/15/or 20 amps. No response. Am I in too much a hurry?
That poster said he exchanged emails and had his 48v/20amp pack within a week. Thanks
Any alternative to Li Ping in price range/proven reliability? Thanks again...

 

[Arbiker501]

I have to say ping has been the best.. I got two packs from him. He did what he said just like clock work.. I did get one pack from new journey . But it was not as smooth as ping..

 

[geoff57]

hi all
ping has 3 48v 20ah packs on ebay as buy it now at $548 plus $110 shipping.
somone might get one instead of getting into a bidding war.

 

[electricridefl]

hey dog,
this is da bomb...the lifepo4 ping packs...The cells are 4950mah, 3.2v...that is stamped on them...a 20ah battery has 4 cells in parallel...I disassembled a 36v 10ah pack and rewire to 72v 5ah...my bike goes over 30mph with a clyte 409 in 26" rear wheel. The range on the 5ah li is about the same as sla 9ah 72v. The lipo is 30lbs lighter...always pulls with full power, no sagging, and this is with the ping battery but no bms or current limit, I charge in halves on 36v ping charger, no bms, My current limit is the 20a controller, I used 2 36v 10ah packs (with bms, and 2c )...They worked fine, but I didn't need that much battery for my 10 mile round trip, so I make single cell battery and treat (charge) like sla battery....these things aren't going to blow up...I have overcharged....didn't seem to hurt anything....and maybe ran cells low when maybe one 5ah 36v half of battery didn't charge, and when I made battery, when cutting off duct tape, the end cell foil cut 1" slit, So maybe this broken seal has something to do with one end cell that just doesn't show a high charge, like when the charger reaches green, and this cell is at 3.4v, and others at 11.8(3cells) and (30.5) (8 cells) , but anyhow, when ride 5 miles and then charge till green light, then turn charger off, then ride home, and ending voltages have been identical in both halves, but after charge, the one half holds above 42v, and the bottom half is 40.4-40.8, and both my other 36v10ah pings settled back to this 40.4-40.8v area. So my battery has been working good. It gets a bit warm after 5 mile trip, discharge at 4c...piece of cake , does not degrade ah capacity, but maybe one cell low because foil got cut....View attachment 1

 

[Ypedal]

How many times have you recharged this pack so far ?

 

[rumped6]

Bikeraider and Arbiker:

Thanks very much for timely replies. I'm not in any great hurry; I'll be patient!

 

[giveahoot]

Looks like there might be some more Chinese competition in the eBay LiFePO4 marketplace... great news for us buyers. A new seller 'buyeasier' put up several packs for a few minutes, only to quickly take them down due to an error in the listing. This seller is located in ShangHai, China, has a 99.0% positive feedback with 296 ratings, and has been a member since Mar-13-06. I hope they are relisted soon.

The packs listed were....
=================
Two 48V/20Ah $519 shipped
Two 48V/15Ah $429 shipped
Two 36V/15Ah $319 shipped
Two 24V/15Ah $249 shipped

Specifications for the 48V/20Ah
===========================
* Battery: Valence
* Fit 48V Motor Wattage: 500 Watt to 1000 Watt, 800 Watt suggested
* Voltage: 48 Volts
* Capacity: 20 Amp Hours
* Weight: 9.00 kg ( 20.00 lbs)
* Charging Voltage: 61 Volts
* Charging Current: <5 Amps
* Rated Discharging Amperage: 20 Amps
* Max Continuous Discharging Amperage: 30 Amps
* Maximum Discharging Current: 60 Amps
* Discharging Cut-off Protection: 35 Amps
* Lifecycle: >1000 times
* CE & SGS Certified!

These packs use a better protective layer than duct tape, but same foil pouches. Also includes a built-in BMS to balance the cells. Apparently Valence is chemically identical to A123. Obviously a very reputable brand selling for many times more a few months ago. As you can see they are certified. Perhaps we now know Ping's source? Anyone on the forum read Chinese? Here is what they look like.