Battery Advice please

[hedsik]

Hi there, a few months ago I did some research on an e-Bike and put it to the side.
I live right on kilometres of wide open footpath but until now, my disability has kept me from enjoying them.

Recently on a whim I purchased this kit here and I require someone in Brisbane to adapt this to my pushbike.
http://www.voilamart.com/48v-1000w-rear-wheel-electric-bicycle-bike-motor-26-inch-cycling-conversion-kit

Then stumbled upon this battery on Alie
http://www.aliexpress.com/item/1000W-Electric-Scooter-Battery-48V-14Ah-E-Bike-Battery-with-54-6V-2A-Charger-30A-BMS/32328122869.html?ws_ab_test=searchweb201556_8,searchweb201602_5_10017_405_404_507,searchweb201603_10&btsid=9814d9a0-7dce-4130-9559-c3c8293aa198

I guess my question is are there any other considerations I need to keep in mind?

Can I go for this 20ah battery and is there any real world differences?
http://www.aliexpress.com/item/48V-20AH-electric-bike-battery-lithium-battery-power-batterywith-charger-kit-BMS-Freeshipping/892935726.html?ws_ab_test=searchweb201556_8,searchweb201602_5_10017_405_404_507,searchweb201603_10&btsid=9814d9a0-7dce-4130-9559-c3c8293aa198

 

[wesnewell]

Yes, there's some very serious differences. The first is rated 90A max and continuous 30A discharge. The second (20ah) is rated fro 30A max and only 12A continuous.

 

[hedsik]

Thankyou for the reply wesnewell
In time i will come to understand more about what those differences mean, but in short which is suitable for the kit above?

 

[Ozzzz]

I cant see any controller specs but must be at least around 20ah. Therefore at least 20ah continuous would handle your needs.
The first one may be ok but be aware they may take a long time to arrive or be knocked back multiple times if they try to send by air. They are also a mixed bag, the cells may be either ok or rubbish. A battery with some reviews may be a better start. 'Ping' sell similar but seem to have a bit of reliable history.



That is one cheap ass kit

 

[John Bozi]

90a discharge looks seriously like there is an error on the first link.

stay away from BS vendors who couldn't be bothered getting that right.

the second one lookds realistic.

I wouldn't personaly buy any batteries from China.

Batteries are as you know already the most expensive part and most dangerous part. If its your first kit pay up some cash for piece of mind in Australia from someone with a physical door you can go knocking on.

I don't have bms knowledge so I cant help you there. I can however sit you down and explain in depth the complexity of taking car of lipo batteries that I run.

I even have some and balance chargers and power supply to get the whole thing working.

You do have to however follow the rules or possibly burn your house down and your loved ones if you don't follow them..... serious right...

2 of these should be enough depending on what your controller pulls and if you have a safe place to store and charge you bike http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=61510

Seriously who needs 20ah if you have bike paths? We could talk more when I know more about your physical situation and the terrain and distances.

 

[hedsik]

Hi John, good timing on your response mate and I thank you for it. Keen to chew your ear off about balance chargers and power supplies! Will PM you shortly
I agree with you that a seller from China does not give two hoots about a new eBike customer from Australia, nor do they accept responsibility if things go pair shaped and it would be very difficult if not impossible to chase them for recourse if disaster occurs.

I am certain there are very capable, ingenious Australian folks who either make batteries, or sell good quality ones at reasonable prices.
If you are such a person, please chime in with your thoughts.

 

[John Bozi]

pic you sent me means it needs something

that is 26 amps capable.

the battery link I posted earlier is a 10c 22v and can do 16ah. This means 10c x 16ah = 160amps capable. You need 44v at least so you need two of those in series.

Hobby king batteries over inflate there capabilities and it is pretty well agreed by many that the true figure is quarter that. 160a / 4 = 40amps.

you should never have a problem pulling 26 amps out of two of those batteries in series.

Again I can't help you unless you are willing to go down the road of the lipo which you need to monitor. They are only two batteries to unhook and balance charge. Or you could bulk charge but must go for a setting that is a bit lower. You could charge the lot to about 4v a cell or around 4v x 12cells =48v max this then leaves wide margin for cell imbalance and safety.

YOu would easily get a 10ah ride out of them still.

Things that I have I am willing to sell.

Statiator charger - this thing can charge any voltage you run up to 60v max. great for bulk charging lipo or charging a battery with bms.

6 series battery balance chargers - these charge those 6 cell battery packs and balances them. These require a power supply.

Above work perfectly.

A power supply which only works at a few amps max. It used to work higher and someone might be able to "fix" it to run higher. But it still does work at a few amps charging.

I have two x 6s 5ah batteries. they probably at their half life. Good for you to get to know lipo and not spend much. I can hook these two up to test run your bike for a few ah ride. They wouldn't be enough for long trips.