Electric Bikes - battery comparrison

When I ordered my new bike , I asked for this battery.
http://hi-powercycles.com/product.sc?categoryId=5&productId=12


Here is the battery I was sent & they tell me that its correct.

http://img.photobucket.com/albums/v246/kingofgreens/bikebattery.jpg?t=1238963405
http://hi-powercycles.com/product.sc?categoryId=5&productId=12
http://hi-powercycles.com/product.sc?categoryId=5&productId=12

How angry should I be here?

You got half the battery you ordered.

Thats about what I thought.

Thanks

please wait for a reply where the poster explains their point of view. Knowing this forum, someone will be along shortly.

I was a bit hasty there, but based on how this pack has preformed so far, It's a real dog compared to what the other is described as.

I would surely like some more information before I act on this issue as I expect it to get ugly.
I could not find that point 1 shanghai pack for sale to get a price comparison so if anyone could give me a link and/or any other info, I'd be appreciative.

Looking at the specs on the batteries . A 10 AH battery at 48 volts, is less than 1/2 of a 20 AH battery at 51 volts. Pretty basic!

I suggest that the site has inconsistent English-Chinese translation. Nobody sells a 51.2V LiFePo4 battery. That is a completely oddball voltage. It's going to be some multiple of 12 (24, 36, 48, 60, 72, etc.)

LiFePo4 batteries run at a higher voltage when compared to SLAs. A SLA that is marked 48 volts may actually measure around 48 volts, where a similar 48V LiFePo4 will measure several volts higher.

I think you received an honest 48V 10ah lifepo4 battery, and the company does not sell 51.2V batteries, nobody does.

I suggest that the site has inconsistent English-Chinese translation. Nobody sells a 51.2V LiFePo4 battery. That is a completely oddball voltage. It's going to be some multiple of 12 (24, 36, 48, 60, 72, etc.)

LiFePo4 batteries run at a higher voltage when compared to SLAs. A SLA that is marked 48 volts may actually measure around 48 volts, where a similar 48V LiFePo4 will measure several volts higher.

I think you received an honest 48V 10ah lifepo4 battery, and the company does not sell 51.2V batteries, nobody does.

There is no such thing as a "regular" 12, 24, 36, 48, 60, 48V etc battery. it is usually rounde ddown to those numbers, occasionally up.

I suggest they actually advertise the actual voltage.

In any case, there is a HUGE difference between a 10 AH battery, and a 20 AH battery, of similar voltage.

How did you determine the AH of the battery he ordered? The page he links is for ordering one of three batteries 10AH,15AH or 20AH. The original poster never mentioned which of the three he ordered nor what price he paid. It's impossible to compare accurately without knowing the AH of the battery he ordered.

If I were you I would try to return it because it clearly isn't the same specs as advertised. Who does that?

What I ordered was the 10AH which is the same capacity as the battery I received.
They tell me that what I have is a 16 cell x 3.2v each which makes it 51.2 volt.
My question is why does it say 48 volt & why does it look so different from the one in the add.
They totally avoid my questions regarding the BMS.

I've discovered that with the strong 40a controller & 600w motor I have, its going to run that battery out pretty quickly, but I'd think I should get more than 20 mins of intermittent throttle from a charge.

In the details of the two batteries you posted, all the specs were on the batteries you showed.

If you ordered the 10AH battery, you got the right one - on the original battery, the one you said you ordered, on the right hand thumbnail, is a 20AH batt spec list. That is the one I looked at.

Looks like you have a choice of 10, 15 and 20ah batt's... if you ordered the 10ah.. then you got the right one.

I believe they advertise it as 51.2v because that is the accurate voltage when the cells are topped off because lifepo4 cells are 3.2v each and if there are 16 lifepo4 cells, then it will equate to 51.2v. Everybody seems to round down the voltage specs to 48v (or 36v, when it really is 38.4, for example). I'm not sure why they do that, to make things simpler/easier for us consumer?

Does it have a BMS built in at least? That would be important too. I can't tell from your pictures.

20 minutes sounds about right for a 40 amp controller with a 10ah battery.

Figure running it at full power (40 amps) it will be dead in less than 15 minutes.

Sustained top speed at full throttle probably pulls around 20 amps, so that would be 30 minutes in an ideal world.

Combined with motor efficiency of 50-80%, so somewhere between 15-30 minutes tops.

It would be a real challenge to squeeze 30 miles out of a battery sized like this. The speed where this motor is most efficient (guessing 30mph or higher) is almost definitely faster than the gearing of the bike will allow you to comfortably pedal. Then to top it off, you'd need to pedal hard enough at that speed to drop the current draw down to only 10 amps and hold it there for an hour, which is very unlikely.

I estimate that with frugal use of the throttle and constant pedaling, this battery has a range of 10-15 miles when riding at 15-20 mph.
Swapping to a 20A controller would help with the range.

I had a 36V 12Ah battery similar to this and I hated the way I had to ride in order to maintain the range.

This is my 1st ebike. I suppose I just expected a lot more for the 2000 USD I spent on it.
Looking around I think I did all right on the deal as I did choose a high end BMC 600w planetary geared motor brushless rear hub & that strong cyrstalyte 40 amp 36-72v controller on a pretty decent Mongoose wing elite bike.
I can't say I have any complaints with the the way the bike runs. It pulls my old fat butt up hills like nothing & is very fast on flat ground.

Maybe this summer I'll just contact Ping & have em build me a 60v 20ah with BMS to put out 40a continuous & then I'll be completely pleased with my rig.

The battery you ordered was a battery created from CELLS..
from my shopping CELL-type Battery Packs..they inform about this technology..
Your first picture describes a 50.4 Volt Battery Pack..your LABEL(photo)stated a 48-volt Battery Pack...
That is very possible considering you have a CELL-type battery Pack..you need to fully charge your Battery Pack..
and measure its STANDING Charge..
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This Standing Charge will offer some first hand info on the quality of your Product Purchase.