BMS Battery, your eperience?

This week I was looking on the 48V 10Ah shrink tube li-ion battery on this site.. The Specs looked really tempting but I decided against it because of the lack of on/off swich and lockable case.

While searching though I was advised by Frank to check the dimensions and weight with them.. I mailed them and confirmed that the description was accurate.

Browsing again at their site for the 48V 10ah alloy shell li-ion after Alby's note ( I should give him credit at this point because he demonstrated great proffesionalism trying to find a solution for me instead of let me wait until the product he is selling is available again) I found out that indeed there is a problem with the dimensions of their products!!!

More info about this at the e-mail I sent to them below:

Hi again! First of all sorry for all this questions, but I am planning on doing a lot of projects and I want to make sure I pick the right product.

 

It must be something wrong with the weights and dimensions of the batteries on the site:

Here are some examples of weird specs:

1) This product: 48V10Ah Li-Ion Shrink Tube EBike Battery Pack - BMSBATTERY Has the exact same cells as this one 48V 10Ah Li-Ion Alloy Shell EBike Battery Pack - BMSBATTERY although the second one is 2,7 kg heavier!!! There is no way the allow shell and lock to be 2,7kg!

 

2) This product: 48V 15Ah Li-Ion Alloy Shell EBike Battery Pack - BMSBATTERY has 50% more cells than this one: 48V 15Ah Li-Ion Alloy Shell EBike Battery Pack - BMSBATTERY and yet it is only 0,5kg more than the second! This is imposible as also it is impossible to have the same dimensions. In general all the alloy cells have the same dimensions! (is it possible that you have only one size alloy case to fit all the batteries, if this is the case it is shame because you loose the compactness potential but is understandable)

 

So I am interested on the exact specifications for this product: 48V 10Ah Li-Ion Alloy Shell EBike Battery Pack - BMSBATTERY

 

Thank you and again sorry for my time consuming questions but I just want to pick the right products and know exactly what I expect.

 

Looking forward to your reply,

John

So, have you tried products from this site? If yes, the dimensions and weight were as described?

Hi

The 48 volt 10AH Ally shell battery weight is 4.25 kilos we buy from the same company that make there battery's

You Note they now fit 20 Amp continues rated packs we had them change it from 10A

They only buy and sell but they do deliver Bit long but Cheap £ 240

Pay by paypal then your money is safe

In china they work for £1 per hour so the mark ups are tiny BUT so is the support

We sell our similar Battery's with charger and UK support for £450 ( we don't sell separate only with our kits )

Our battery's are modified in the UK to Plug into our controllers and work reliably and we offer a 12 month warranty as we have a workshop and spares to repair even 3 years down the road ( so not Like for Like )

I would recommend the 15 AH 50% more range 6 kilos £300

our price £650 ( not sold separate only with our kits )

If you are on a Budget GO for it They will Deliver 4 to 6 weeks

Frank

Edited May 14, 201114 yr by banbury frank

Hmmm.. It is for a folding bike so weight is an issue.. 6 kg for the battery is too much..

The 4,25kg is passable... I was hopping for a black cover but I might take a look.. This means that this product has no warranty ?

I saw that they have them in stock with 5-7 days delivery time, what makes you think it will take that long?

Ps: please, can a mod add an x to the title?

Hmmm.. It is for a folding bike so weight is an issue.. 6 kg for the battery is too much..

 

The 4,25kg is passable... I was hopping for a black cover but I might take a look.. This means that this product has no warranty ?

 

I saw that they have them in stock with 5-7 days delivery time, what makes you think it will take that long?

 

Ps: please, can a mod add an x to the title?

Several people here have ordered stuff from them and it always seems to take 4 to six weeks. Their weights and sizes for their batteries always seem to be wrong - the same as some of the other Chinese suppliers. It's a mystery why. It'll be difficult to send anything back for a refund because of the huge shipping costs. If weight is an issue, why do you need a 48v battery? Lipos are much lighter and more powerful, but you need to know how to handle them.

Hi

48 Volt 10 AH should Be Fine on a folder so would a 10 AH 36 volt only 3.5 kilos

It Has a warranty but sending back to China is not Cheap and they charge to return it

Other Members have reported 4 to 6 weeks delivery

You could easily spray the aluminum case black with a spray can

Any comments from members on delivery Times ????????????

Frank

What is the continious discharge anyway? I found an other option that seems better with less weight more compact and in a better looking case.. But it only has 10ah continuous discharge.. How is this translated, will not cope well with the 20amp ezee controller?

Buy 48V10AH, e-bike battery, 48v battery, 48V10AH E-Bike Lithium Battery with charger at Aliexpress.com

Hi It means if you try and take 20 amps it will shut the battery down and you will have to disconnected:cool: the battery to reset the BMS

Frank

Several people here have ordered stuff from them and it always seems to take 4 to six weeks. Their weights and sizes for their batteries always seem to be wrong - the same as some of the other Chinese suppliers. It's a mystery why. It'll be difficult to send anything back for a refund because of the huge shipping costs. If weight is an issue, why do you need a 48v battery? Lipos are much lighter and more powerful, but you need to know how to handle them.

I thought that lipo cells were stable now, or at least that is what I ve been told..?

The quality of some manufacturers are way better now than the used to be a few years back, so they stay in balance well and are less likely to ignite for no apparent reason. However, abuse them in use or damage them physically and they can still produce fireworks.

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Hi peasjam

What bis the problem with your 48 volt 16 ah battery

when you bought it you had the option of BMS size

Which one did you buy

Frank:cool:

I got a reply from them thanking me for quoting the mistakes on their site and it seems they corrected them.. He corrected the battery in question for sure, rating it to 4kg which makes sence comparing it with the 6kg for the 15ah one and with the 4,25 frank said.

I might go for it if alby agrees...

My 10Ah 24V (7s2p) battery arrived in 11 days, no extra duty requested and the weight was just 20g under the advertised weight of 1.7kg.

Well this is encouraging..

Which delivery service did you used?

also, is Li-Ion NiCoMn a lithium polymer battery?

Hi peasjam

 

What bis the problem with your 48 volt 16 ah battery

 

when you bought it you had the option of BMS size

 

Which one did you buy

 

Frank:cool:

Hey Frank.

I didn't get any options regarding the BMS so I'm not sure what is contained within the battery packaging. I'm assuming that's where the problem lies, but I'm not really very knowledgeable about these things.

The problem I have is that, when not connected to the controller I get a 48.3v reading at the terminals.

As soon as the controller is connected this drops to 5.1 volts.

I have verified that the controller wiring is correct, and that it and the motor works essentially by powering it directly from the charger (with the battery in sequence).

I might ask on endlessSphere, but I suspect the advice will involve tearing the pack apart which I'm not willing to do as it was $400 and I don't know what I'm doing.

Hi peasjam

If your battery is reading 48 volts it is flat

It should read 52 to 54 volts when charged

what lights do you get on the charger

Frank

Hi peasjam

 

If your battery is reading 48 volts it is flat

 

It should read 52 to 54 volts when charged

 

what lights do you get on the charger

 

 

Frank

I did wonder if this might be the case. The charger light is green indicating it's fully charged, voltage reading on charger is 58v and amps 0.0, so I'm wondering if the BMS is misreporting the charge level to the charger so it's not actually charging it.

Matt.

Edited May 16, 201114 yr by peasjam

Hi peasjam

Try plugin in the battery to the charger before you connect the mains

could be faulty charger

Approx where are you I can test and Carry spare bms in stock

Frank:cool:

Hi peasjam

 

Try plugin in the battery to the charger before you connect the mains

 

could be faulty charger

 

Approx where are you I can test and Carry spare bms in stock

 

Frank:cool:

I'm just a few miles Northwest of Cambridge, so a couple of hours from Banbury. I'm not adverse to the idea of throwing everything in my boot and coming down your way one Saturday morning though. I have a bike rack so it's pretty easy for me.

Matt.

Hi Matt

We are open 7 days a week

Just call and let me no and i will give you the address

Frank:cool:

I got a reply from them thanking me for quoting the mistakes on their site and it seems they corrected them.. He corrected the battery in question for sure, rating it to 4kg which makes sence comparing it with the 6kg for the 15ah one and with the 4,25 frank said.

 

I might go for it if alby agrees...

 

 

 

Well this is encouraging..

 

Which delivery service did you used?

also, is Li-Ion NiCoMn a lithium polymer battery?

I used the cheapest delivery option and yes, these are lithium polymer cells.

Update on BMSBattery and my battery issue which I'm certain is a duff BMS.

I got an extremely quick response from them:

Thank you for your business! Are you charging with 900W changer? It will damage the BMS in the battery pack. You need to update the BMS to 30-60A version.

If true, it's frustrating that they'd supply an unsuitable BMS given everything was ordered at the same time. I'm wondering if I made a poor choice with the 900W charger and should have gone for something like the 400W.

If true, it's frustrating that they'd supply an unsuitable BMS given everything was ordered at the same time. I'm wondering if I made a poor choice with the 900W charger and should have gone for something like the 400W.

I seem to remember something on their website (perhaps before they changed it) that mentioned something about needing the upgraded BMS with that charger. I think that the one downside to ordering stuff from these Chinese suppliers is that their ordering systems are not very clear, so you can't always be sure what you get. To be fair to BMSbattery, they sent me about 5 e-mails asking me what exactly it was that I wanted, even though I thought I had made it absolutely clear. I'm not sure that they weren't trying to change my mind to something they had in stock.

It looks like you only need to get a new BMS then - not as bad as a whole new battery, but you'll have to figure out how to disconnect the old BMS and solder on the new one. You must be frustrated that now you've got to wait for the new BMS. Anyway, at least there's a solution on the horizon - better than not knowing what's wrong!

Absolutely. The worst thing is the frustration of not really knowing where the problem lies and what the next step should be, at least I can get it sorted now. I'm a bit gutted it's going to delay things somewhat, perhaps I'll be lucky and BMSBattery ship it promptly

You guys and also endlessSphere have all been really helpful in getting to the bottom of it.

Not looking forward to the soldering though. Since everything went lead free I find it a bit tricky.

Edited May 17, 201114 yr by peasjam

Not looking forward to the soldering though. Since everything went lead free I find it a bit tricky.

You can still get normal tin/lead solder. I'll send you some, if you can't get it from the shops - just ask. Don't waste your time with the lead-free stuff.