Oxygen Emate Battery

[Jonah]

I have received a call from an owner of a 4 year old Oxygen Emate with a dead battery (13Ah). He has been advised that replacement batteries are no longer available. Does anyone know differently?

 

[Deleted member 4366]

If it's the old plastic type, they are still available, but difficult to find. I've seen them on Aliexpress when I've been looking for other things, but there's so many other batteries, it's like a needle in a haystack..

If you can't find one, and you have basic electrical skills, you can swap the cell-pack from a standard silver fish battery. I did that to my one. The later aluminium batteries are still all available.

 

[selrahc1992]

If it's the old plastic type, they are still available, but difficult to find. I've seen them on Aliexpress when I've been looking for other things, but there's so many other batteries, it's like a needle in a haystack..

If you can't find one, and you have basic electrical skills, you can swap the cell-pack from a standard silver fish battery. I did that to my one. The later aluminium batteries are still all available.

apologies for a slight detour, but how hard is it to build a 48V battery with BMS from Samsung cells? funds are very limited an I have a city bike running on 12S lipos and my experience with an oxydrive kit made me realise bottle batteries are so much easier to live with

 

[Deleted member 4366]

It's dead easy if you can solder and have the special strip welder. A cheap welder costs just over £100, so not ecomomical for a single battery. Some sellers will weld your cells into parallel strings, so you only need to solder joining wires to make a 13S battery.

To be honest, for the price of the cells, BMS and connectors, you can buy a complete ready-made battery with the same cells, so it's only worth doing if you need a custom battery. Even then, it can work out cheaper to buy a ready made battery, from which you can take out the cell-pack and reconfigure it.

 

[selrahc1992]

It's dead easy if you can solder and have the special strip welder. A cheap welder costs just over £100, so not ecomomical for a single battery. Some sellers will weld your cells into parallel strings, so you only need to solder joining wires to make a 13S battery.

To be honest, for the price of the cells, BMS and connectors, you can buy a complete ready-made battery with the same cells, so it's only worth doing if you need a custom battery. Even then, it can work out cheaper to buy a ready made battery, from which you can take out the cell-pack and reconfigure it.

Many thanks, that's very helpful info. is BMS battery still the best place to buy bottle batteries (it's not exactly cheap with freight etc). Why, as a complete aside isn't it feasible to make bottle batteries with lipo pouches such as, I gather large lipos from say hobby king are made off? with a BMS I would have imagined that would be very cheap. I gather you've used aliexpress - but also that many people get ripped off using it. how do you know you're dealing with a reputable seller?

 

[Deleted member 4366]

You could make your own bottle battery if you have the skills. I've seen a few DIY ones made out of a piece of drainpipe with lipos stuffed in. Lipos are the same voltage as 18650 cells, so for 13S you can use a normal BMS.

Aliexpress is OK. It tells you how long people have been trading and who has a gold star or whatever. I've used Aliexpress loads of times for all sorts of things and never had a problem. The only thing I wouldn't buy from there nor Ebay is 18650 cells unless somebody had already confirmed them to be good.

 

[selrahc1992]

You could make your own bottle battery if you have the skills. I've seen a few DIY ones made out of a piece of drainpipe with lipos stuffed in. Lipos are the same voltage as 18650 cells, so for 13S you can use a normal BMS.

Aliexpress is OK. It tells you how long people have been trading and who has a gold star or whatever. I've used Aliexpress loads of times for all sorts of things and never had a problem. The only thing I wouldn't buy from there nor Ebay is 18650 cells unless somebody had already confirmed them to be good.

many thanks, 6s and 4s is cheap and big http://www.hobbyking.co.uk/hobbyking/store/__66310__Multistar_16000mAh_6s_10c_EU_Warehouse_.html
but 7S isn't. apologies for a noob question - but is it as simple as separating a pouch from a 6S of similar size (say a 16A/h) and adding it to another to make 7S and is that possible/doable/simple?

 

[selrahc1992]

many thanks, 6s and 4s is cheap and big http://www.hobbyking.co.uk/hobbyking/store/__66310__Multistar_16000mAh_6s_10c_EU_Warehouse_.html
but 7S isn't. apologies for a noob question - but is it as simple as separating a pouch from a 6S of similar size (say a 16A/h) and adding it to another to make 7S and is that possible/doable/simple?

apologies should have googled, found this

it makes it seem pretty straightforward with BMS to end up with 16A/h 48V for around £180 (with BMS) unless I'm missing something?

 

[Deleted member 4366]

You can get special 12s BMSs from BMSBattery as well. The 16ah 6S Multistars are quite big and heavy compared with a normal Ebike battery. Make a cardboard mockup to see where you can fit a pair. It won't be easy to fit them in the frame triangle.