would you trust his ebay battery seller?

[mrfeelgooddrag26]

http://www.ebay.com/itm/48v-25ah-LiFePO4-Battery-5A-Charger-Electric-Scooter-Bicycle-By-Sea-7-8-Weeks-/171051055088?pt=US_Rechargeable_Batteries&hash=item27d36ff7f0

i read thru about 4 pages of feedback and they seem to pretty legit i have not read any negative feedback it seems everybody is happy with the product im getting my taxes back soon and i want to buy a ebike battery would this be a good choice anybody out there ever bought from this seller? im buying a 48 volt 1000 watt kit when i get paid again im just trying to figure out what battery i want to use and what will work best for my needs

 

[Kent]

Even if it performs well, which is unknown, are you prepared to deal with its size and weight? Many folks like to break up something that large into two smaller packs which are easier to position and also to redistribute the weight.

Give some thought to your battery mounting. It is not recommended that you strap it to a rear rack. Most racks cannot handle that much weight and it also makes the bike very tail heavy and unbalanced.

Check out how others here have dealt with similar challenges. Good luck and enjoy your build.

 

[Drunkskunk]

I wouldn't trusty that seeller as far as I could throw them. 100% feedback and nothing but high praise. I find that story as likely as a striper claiming to be a virgin.

But would I buy it? Maybe. I wouldn't risk it if I couldn't afford to lose the money. But it's possable this is a good vendor selling a good battery that you will be happy with it.
Its also possable Kitten Coxlave realy is a virgin.

you might check out EM3ev.com. Those batteries are proven to work.

 

[mrfeelgooddrag26]

for now its either going on a rear rack or in a front mounted handle bar rack im not hacking up 500 dollars worth of battery just to reposition weight its 25 pounds at most i rode my first ebike with over 40 pounds of sla in a front mounted handle bar rack im pretty sure all be fine with a 25 pound battery either rear mounted or front mount from what im seeing as far as feedback im willing to take a shot on it if it dosent perform as stated then i guess i can move onto another battery technology haha

 

[dnmun]

they have a 20Ah and 15Ah pack, free shipping too. but if you need to split it into two sections you can do that easily with the pouches. i do it all the time with the ping packs.

this guy is about the same price or slightly less than sun-thing guy.

 

[dogman dan]

Not a seller I have heard about. At least they appear to be pouch cells, that have a better reputation for arriving with no shipping damage than the V power round cell packs.

One Ebay vendor with some feedback here at ES, is a guy called sunthing. We do know he ships pouch packs. His chargers suck, but that's easy to fix.

This for a bike? Carrying 25 pounds of battery is pretty tough unless it's a cargo carrying bike of some kind.

 

[Wishes]

I've had the chance to examine 5 battery packs that were bought on ebay. None of them from this seller though. They were bought by friends and customers. 3 were brought to me for testing, the other 2 i asked for them to test.

I found that they all had high internal resistance, and not 1 of the single battery packs came close to its rated capacity. I ran my tests until the BMS cut off to determine their capacity.

Point is, as another member mentioned, its a chance you take. Might end up being an excellent battery pack, it also might not. Many of the really cheap battery packs you see for sale are put together with "reject" cells. Beware of deals that are too good to be true when it comes to Lithium batteries.

Wishes

 

[Jason27]

Omg eBay batteries are garbage. Plus how do you return it if it goes bad after a month?. Run away!!

 

[dnmun]

i looked at the picture on that website of the pouches they showed in a stack and they all look identical to the pouches that ping uses in his packs, even down to the location of the zebra label on the pouch that is used to accurately track them in production.

if you do a battery capacity test, you have to really be careful to verify that every cell has been fully charged to 3.65V before discharging the pack and then you need to actually measure the voltage on the cell as it is discharged so you can tell which cells are short of capacity and which are normal.

i find there can be up to 20% missing in a capacity test without carefully controlling how the discharge is measured. plus the cells will hit LVC long before they are actually totally discharged so you have to keep the discharge rate low and very low at the end to get consistent numbers. from my experience.

so i find that packs with low capacity usually are just outa balance and undercharged.

i see no reason to not try these packs and they sure are cheap so if we can get some useful information from you after you buy them it will help others determine if they wanna buy from him too.

 

[dogman dan]

On the other hand, I never had any trouble getting very close to the full rated capacity from my Lifepo4 packs bought from Pingbattery.

Just riding them at 15 amps average discharge rate would get me almost the rated capacity, if I let the charger balance them overnight first.

You want a lifepo4 you can feel sure about, Pingbattery.com

 

[jay7264]

i have a sunthing battery and it provides me with 20 miles of riding easy i have not hit lvc. the battery is 36v 20ah my bike got a 7t mac on it i ride it like i stole it pretty much 28-30 mph constant and that battery is holding up well and balances quickly

 

[granolaboy]

for a battery like that, I'd also say just go to pingbattery.

If you need higher current, then it's em3ev or osn power...

 

[Tench]

Are we talking a big cost difference between this battery and a Ping? if not I would go for the Ping every day! The father in law has been using the 36v 20ah Ping I bough many years ago and its still going strong, we limited the consumption of the 900w Cyclone to 1350w via the CA so it pulls a max of 1.9c and he doesn't spare the horses, the battery has been great!
If there is a big difference you got to weigh up whether you are prepared to take the risk of an unknown battery to save a few quid.

 

[dnmun]

looks like about 45% difference in cost. maybe 50%, for what appears to be the same parts. but if you wanna buy from ping that is ok too. his stuff is well built like i said. but to call it unknown is a distortion because you can see the pouches in the picture on the website.

 

[999zip999]

I wouldn't if going cheap. I would go sunthing. If going cheaper it could expensive with a total no name zero support battery.

 

[mrfeelgooddrag26]

the thing that is pissing me off is sun-thing wants way more for his batteries and cycling2013 is asking less and they have the SAME exact photo's of the prismatic cells witch leads me to believe there the same people or company just trying to sell more product also one battery is lighter by 2 kilos than the other

 

[mrfeelgooddrag26]

ive pretty much decided to buy from cycling-2013 off ebay it seems to me that sun-thing is just a reseller and not a builder in his photos it shows a warehouse full of boxes waiting to ship im pretty much guessing hes buying in bulk from the true source and then adding on a fee to his selling price when i get my money im going to buy the battery i linked then i will get to the bottom of if they are selling quality batteries or not im going to do a millage test and a capacity test of the whole battery

 

[999zip999]

Let us know how things work out. Good luck.

 

[dnmun]

ive pretty much decided to buy from cycling-2013 off ebay it seems to me that sun-thing is just a reseller and not a builder in his photos it shows a warehouse full of boxes waiting to ship im pretty much guessing hes buying in bulk from the true source and then adding on a fee to his selling price when i get my money im going to buy the battery i linked then i will get to the bottom of if they are selling quality batteries or not im going to do a millage test and a capacity test of the whole battery

i think you are wrong. i think they both assemble the packs in their own shop. the pouches are made by the billions in china. you can buy them relatively cheaply in 10,000 unit lots.

 

[dogman dan]

Photos on ebay are always exactly what you will get. 8)

I don't doubt they are selling pouch cells, but I do say that I have not read about a happy customer for this particular ebay vendor. That only means that I have not read of a happy customer on this forum. That's typical, happy customer is out riding.

In general, the 5 ah lifepo4 pouch cells are more or less the same, ( expected to handle at least 1-2 c) but how they were treated since they left the factory, how old they may be, can vary.

Somebody has to try the vendor. Could it be you? Many years ago, I was among the very first to send a pile of cash to Li Ping. At the time I was shitting my pants, and my wife was just shaking her head thinking I was pissing away $400.

 

[alsmith]

looks the same as hunk-801 and sun-thing28 battery, the biggest problem with ebay ratings is that buyers put them on soon after getting the thing, there's no feedback after having it for a reasonable length of time. My first battery was from ebay, seemed fine so I left positive feedback. It took a while to work out that my 20Ah battery was only 12Ah- too late to leave accurate feedback. And of course support was non-existent. Personally I'd never buy an ebay battery again without getting proper feedback.

 

[dnmun]

looks the same as hunk-801 and sun-thing28 battery, the biggest problem with ebay ratings is that buyers put them on soon after getting the thing, there's no feedback after having it for a reasonable length of time. My first battery was from ebay, seemed fine so I left positive feedback. It took a while to work out that my 20Ah battery was only 12Ah- too late to leave accurate feedback. And of course support was non-existent. Personally I'd never buy an ebay battery again without getting proper feedback.

how did you determine it had 12Ah?

 

[alsmith]

calibrated cycle analyst to Lyen controller shunt value, and confirmed by 2 other batteries (headway cells)

 

[dnmun]

were you able to measure cell voltage before and during the discharge or did you do this while riding your ebike? can you tell how well the charger and BMS balance the pack and if it is able to fully charge the cells?

i just tested a ping pack i bot and i charged them all up above 3.65V and it had 14.75Ah on the lowest capacity cell. the highest was about 16Ah for a 15Ah pack. it is about two years old but it did have one puffer, just starting to puff and it was on the low capacity cell.

 

[alsmith]

I did test this at the time, including charger voltages, you were kind enough to help with a lot of advice as well as the information on your many posts on this subject. I even stripped the pack, found a few bad and broken solder joints but even after sorting it the capacity remained woefully low at the same 12Ah- I had thought those fixes would give it a bit more capacity. I even tried a new BMS.