Help! Use of balanced charger

[mikeconnect]

IM new here . I have one of my giant suede . Bike with limited range battery I’ve been Told it may be revitalised with a baa as lances charger subject to cell tests . Anyone prepared to give me a brief idiots guide for procedure
Thanks
Mike

 

[vfr400]

A 36v lithium-ion battery has 10 cell-groups. They each need to be the same voltage otherwise you lose capacity. There is a management pcb (BMS) that takes care of balancing provided that you fully charge each time. There is a wire from each cell group that goes to the BMS so that it can check the cell voltages. These wires are normally come to single multi-pin connector that plugs into the BMS. You can unplug it and check the cell voltages with a meter by measuring each pair of adjacent pins. Here's a picture that should help:


If they're wildly out of balance you can balance them manually with an RC balance charger using pinstrip to connect the two. The charger has a balance function. Once set and activated, everything is automatic. RC chargers normally only go up to 6S, so you can balance up to 6 adjacent cells at a time

You can also charge one cell at a time with a 5v USB charger, but you have to keep an eye on it to make sure that it doesn't overcharge.

 

[mikeconnect]

A 36v lithium-ion battery has 10 cell-groups. They each need to be the same voltage otherwise you lose capacity. There is a management pcb (BMS) that takes care of balancing provided that you fully charge each time. There is a wire from each cell group that goes to the BMS so that it can check the cell voltages. These wires are normally come to single multi-pin connector that plugs into the BMS. You can unplug it and check the cell voltages with a meter by measuring each pair of adjacent pins. Here's a picture that should help:
View attachment 37557

If they're wildly out of balance you can balance them manually with an RC balance charger using pinstrip to connect the two. The charger has a balance function. Once set and activated, everything is automatic. RC chargers normally only go up to 6S, so you can balance up to 6 adjacent cells at a time

You can also charge one cell at a time with a 5v USB charger, but you have to keep an eye on it to make sure that it doesn't overcharge.

Thanks vfr. I’ll have a look and if my head doesn’t hurt I’ll give it a go for the cost of a balanced charger .
imJust waiting For Neal To answer my last query on mosfets . Think they’re ok but not sure about something . See my last post on the other thread
Thanks

 

[vfr400]

Before buying the charger, measure the cell voltages. If it's already balanced, you won't need the charger.

 

[mikeconnect]

Ok

 

[mikeconnect]

A 36v lithium-ion battery has 10 cell-groups. They each need to be the same voltage otherwise you lose capacity. There is a management pcb (BMS) that takes care of balancing provided that you fully charge each time. There is a wire from each cell group that goes to the BMS so that it can check the cell voltages. These wires are normally come to single multi-pin connector that plugs into the BMS. You can unplug it and check the cell voltages with a meter by measuring each pair of adjacent pins. Here's a picture that should help:
View attachment 37557

If they're wildly out of balance you can balance them manually with an RC balance charger using pinstrip to connect the two. The charger has a balance function. Once set and activated, everything is automatic. RC chargers normally only go up to 6S, so you can balance up to 6 adjacent cells at a time

You can also charge one cell at a time with a 5v USB charger, but you have to keep an eye on it to make sure that it doesn't overcharge.

I won’t get balanced charger until i test voltage . But I was told voltage reading from multimeter needs to be gone under load . Is that correct ? And considering the Giant Suede goes back to 2005 is it still possible that battery can be revitalised ?

 

[vfr400]

You don't have to test under load for balancing that just shows if you have weak cells.

A 2005 battery is not likely to be very good. Is it NiHm or Lithium?

 

[mikeconnect]

You don't have to test under load for balancing that just shows if you have weak cells.

A 2005 battery is not likely to be very good. Is it NiHm or Lithium?

Not sure it will be original in Giant Suede . Travelling at moment can’t check spec

 

[mikeconnect]

You don't have to test under load for balancing that just shows if you have weak cells.

A 2005 battery is not likely to be very good. Is it NiHm or Lithium?

Nimh if it’s original one

 

[vfr400]

Nimh if it’s original one

if you open the case, it should be obvious. NiHms are big cylindrical things like C-cells

 

[mikeconnect]

if you open the case, it should be obvious. NiHms are big cylindrical things like C-cells

It’s nimh and I know it’s obvious but I’m gonna have to break the wrapping . So what’s best to rewrap it plZ
What’s your opinion ? Is it better to aliexpress for 45 -55 quid or shall I open the cell wrap and check

 

[vfr400]

It’s nimh and I know it’s obvious but I’m gonna have to break the wrapping . So what’s best to rewrap it plZ
What’s your opinion ? Is it better to aliexpress for 45 -55 quid or shall I open the cell wrap and check

You don't have to balance nihms. If the pack voltage is down, they're probably scrap. There's no BMS either.

 

[mikeconnect]

You don't have to balance nihms. If the pack voltage is down, they're probably scrap. There's no BMS either.

Ok thanks .so if I buy Ali. Which do you recommend ? Do I need to buy set of charger And battery ? or can I get one that will fit existing charger which I think is provably a better charger. If there’s any chance of a link plz . Existing is 36v 9ah nimh but I assume I can get lithium ?? And maybe bigger ah ??

 

[vfr400]

Ok thanks .so if I buy Ali. Which do you recommend ? Do I need to buy set of charger And battery ? or can I get one that will fit existing charger which I think is provably a better charger. If there’s any chance of a link plz . Existing is 36v 9ah nimh but I assume I can get lithium ?? And maybe bigger ah ??

I'd chuck it all and get lithium.

 

[mikeconnect]

I'd chuck it all and get lithium.

Will do And I know I need 36v but bear in mindIt’s not my thing and I need to be sure which one to buy and whether I need One with a new charger . These giant chargers have a label on them staying nimh charger . So do I need battery and charger? And I’ll need advice on how to swap into the giants battery casing and connections
I’d better break down my questions
1. 36v Lithium ? With new charger ?
2.anything that will fit in Existing battery housing ?
3. Existing 9 ah . WhT size ah Do I get. How much more ah?
4 Do I have to adapt Casing to receive new charger connection And do I need to get a female connector for new charger ?
5. Do I need one with all other connections same as original or do I just adapt ?
thanks

 

[Nealh]

What ever battery chemistry you buy make sure you buy a battery and charger together, that way you can't go wrong.
Nimh charger is no good for lithium, stick the charger in room101 and forget about it.

For 36v I would simply buy one off ebay if your bike can use any generic battery.

 

[vfr400]

Will do And I know I need 36v but bear in mindIt’s not my thing and I need to be sure which one to buy and whether I need One with a new charger . These giant chargers have a label on them staying nimh charger . So do I need battery and charger? And I’ll need advice on how to swap into the giants battery casing and connections

Most batteries come with a charger. The nihm charger probably wonz't work any because they normally monitor a temperature sensor, which a lithium battery doesn't have.

 

[Nealh]

Nimh cells are 1.2v nom with a max 1.4 - 1.5 top voltage, most Li is 4.2 v max per cell. Use the correct charger to do the job.

 

[mikeconnect]

What ever battery chemistry you buy make sure you buy a battery and charger together, that way you can't go wrong.
Nimh charger is no good for lithium, stick the charger in room101 and forget about it.

For 36v I would simply buy one off ebay if your bike can use any generic battery.

Thanks Nealh. I edited this post bit later with 5 questions to make sure I know what to buy and what to do as I’ve not done it before. If I can get answer to 5 questions Whenever you or vfr see them later thanks

 

[mikeconnect]

Hope I guys dint mind a different question on this thread cus not received answer on my new thread .
my second bike I just got is pedal assist only but motor kicks in immediately any Pedal pressure Felt even if I’m stationery . Can that be right ? Frightened it’ll damage motor when I’m stationery . Other bike you need to get up to a certain speed before motor comes in