need help for battery analysis

kilowat

100 µW
Joined
Nov 6, 2014
Messages
9
I need your experience, I'm about to buy a battery, on a seller, I ask the state of the batteries, apparently Chinese batteries "sanyo"
what do you think about these sanyo batteries?
are 48v40ah batteries .
"They are from Sanyo with 2 years guarantee;
I also tested them out of the output with a multimeter in series: voltage started max 53.6 and gradually fell empty to 45.3V.
I trust the supplier of the batteries: it is a serious company

is it normal that the voltage drops as much ?
 
"Real" Sanyo batteries are good quality. Just not rated for super high discharge current. 40Ahr is a very large battery.

The voltage range you show is quite normal going from full charge to empty (indicates 13 series cells).
 
kilowat said:
I need your experience, I'm about to buy a battery, on a seller, I ask the state of the batteries, apparently Chinese batteries "sanyo"
what do you think about these sanyo batteries?
are 48v40ah batteries .
"They are from Sanyo with 2 years guarantee;
I also tested them out of the output with a multimeter in series: voltage started max 53.6 and gradually fell empty to 45.3V.
I trust the supplier of the batteries: it is a serious company

is it normal that the voltage drops as much ?
Can you supply the sellers name/company?

Dan
 
I will ask more information to the seller and I will come back to you
regarding the discharge up to 45v, a 48v battery should not stay at least 48v?
thank you
 
kilowat said:
I will ask more information to the seller and I will come back to you
regarding the discharge up to 45v, a 48v battery should not stay at least 48v?
thank you
48V Is just the nominal voltage, which is close to the middle of the upper and lower voltage of the cells. 45v would be the low end of the cell voltage and 53/54 is the top voltage.
Normal.

Dan
 
If you really want a good technical opinion, you must link us to the battery sale page so we can see it's specs/etc.

It all sounds pretty normal, but as noted above, it's a really big and heavy battery. Probably weighs close to 30-35lbs or more.

You don't want that on a rear rack. ;) And it's unlikley to fit in a triangle bag or box.
 
hi
caracteristique :
Standard voltage: 48v
Nominal capacity: 13.2Ah
Standard continuous discharge current: 1.1A
Maximum continuous discharge current: 2.2A
Working temperature: Charging: 0 ~ 45 ℃; Discharge: -20 ~ 60 ℃
Product Size: 35 * 35 * 70mm
Cycle life: 500 times
Output mode: UL1007 / 22AWG line length 60mm (can be customized according to customer requirements)
Main protection function: overcharge protection, over discharge protection, short circuit protection, overcurrent protection, current balance, over temperature protection

the batteries were bought at king-energy.com

thanks
 
kilowat said:
Standard voltage: 48v
Nominal capacity: 13.2Ah
Standard continuous discharge current: 1.1A
Maximum continuous discharge current: 2.2A
Cycle life: 500 times
Output mode: UL1007 / 22AWG line length 60mm (can be customized according to customer requirements)
Main protection function: overcharge protection, over discharge protection, short circuit protection, overcurrent protection, current balance, over temperature protection

Well, not quite 40Ah.

2.2A discharge current seems extremely low for a battery this size. Something seems wrong about those numbers.
22AWG wire is about right for 2.2A.

This will not power a bike. What is your application?
 
yes sorry

http://www.king-energy.com/default2-name=48V20AH_Lithium[kongge]polymer[kongge]battery[kongge]pack.htm


I am a novice and I notice in fact that the wire is abnormally too thin, especially since I had the idea of pairing two 48v 40ah batteries to put in a stealth bomber 52, this is not going to do I think?

the person has several batteries,
I had two ideas for two different bikes

first bike: a suspended full which I would like to install a kit bbshd 1000w.
second bike: an old stealth 52 bomber of 2013 whose battery was not charged correctly and found it unusable.
 
The battery in the ad will not be suitable for a bike of any kind. Way too low current rating.
 
kilowat said:
http://www.king-energy.com/default2-name=48V20AH_Lithium[kongge]polymer[kongge]battery[kongge]pack.htm
I am a novice and I notice in fact that the wire is abnormally too thin, especially since I had the idea of pairing two 48v 40ah batteries to put in a stealth bomber 52, this is not going to do I think?
As has already been pointed out, that is not a 40Ah battery.

In fact, the page has at least two contradictory capacities--it is titled as a 20Ah battery, but the "specs" say it is 13Ah.

Whether it is just a mistake or a deception, either one makes the seller untrustworthy and I would not purchase anything from them (because you cannot trust *anything* any of their pages say about any of their products).

Even if they were trustworthy, that battery is (as others have said) completely insufficient for EV motor use.

You would have to parallel 40 or 50 them to get any reasonable current out of them for a high powered bike like the Stealth series, and at that point you'd need a trailer to carry them.

I'd recommend checking out http://ebikes.ca or maybe Luna or even Allcell, for ebike batteries.

But before you look into a battery, you first need to know what the current (amp, A) requirements are for the bike it's for. Then you have to see if the battery you are looking at can handle that.
 
Too many red flags for you to buy that one. Confusing specs just mean you send money, then they send something, whatever.

Zero chance you get what you thought you bought.
 
arf
I understand better now why the salesman wants to get rid of it.
I abandon this track in this case.
thanks guys ! :)
 
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