boston swing 5300 battery 3000 cycles

Batteries, Chargers, and Battery Management Systems.
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peleap
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boston swing 5300 battery 3000 cycles

Post by peleap » Jul 13, 2017 12:54 am

Who used to use this type of battery?
I have a question
1. Type of battery ? ( lithium manganese oxide or lifepo4)
2. 2000-3000 cycles true or fake
3.Why not get popular

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cheapcookie
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Re: boston swing 5300 battery 3000 cycles

Post by cheapcookie » Jul 13, 2017 1:17 am

Nice find!

You know what it is?

It is two 18650 in a nice little package!

Peace.

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JimFritzMI
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Re: boston swing 5300 battery 3000 cycles

Post by JimFritzMI » Jul 13, 2017 1:19 am

I don't know the exact chemistry, but I know they aren't LiFePo4 batteries as their nominal voltage is 3.65V.

Hillhater
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Re: boston swing 5300 battery 3000 cycles

Post by Hillhater » Jul 13, 2017 1:55 am

cheapcookie wrote:Nice find!

You know what it is?

It is two 18650 in a nice little package!

Peace.
Nope !
It does look like 2 18650s side by side, ..but it isnt.
Boston power have their own unique cell format.
This forum owes its existence to Justin of ebikes.ca

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peleap
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Re: boston swing 5300 battery 3000 cycles

Post by peleap » Jul 13, 2017 4:46 am

Hillhater wrote:
cheapcookie wrote:Nice find!

You know what it is?

It is two 18650 in a nice little package!

Peace.
Nope !
It does look like 2 18650s side by side, ..but it isnt.
Boston power have their own unique cell format.
size about 2 18650 (volume) and Weight 100 grams

redilast
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Re: boston swing 5300 battery 3000 cycles

Post by redilast » Jul 13, 2017 5:01 am

I have a battery pack that has like 15 of these cells or so in it. I ordered another battery from a supplier they sent me the wrong one and told me to keep it lol.

The cycle life seems pretty impressive, but is it true?

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dogman dan
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Re: boston swing 5300 battery 3000 cycles

Post by dogman dan » Jul 13, 2017 6:31 am

I'm sure its true, for one cell in perfect lab conditions. One of those conditions is that it pretty much never sits there in a hot garage or parking lot, fully charged. The other is the cell can cool itself while it discharges, all alone on that lab bench.

Put it in a pack with hundreds of other cells, and park it out there in the real world, and you aint gonna see 3000 cycles.

2-4 years is typical for most of us. Number of cycles may not mean a thing, but number of days out in real world weather does.

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Re: boston swing 5300 battery 3000 cycles

Post by Hillhater » Jul 13, 2017 8:15 am

The 21700 Tesla cells used in their powerpacks are warranted for 80% capacity retention after 5000 cycles in normal use .

Naked Image of the Boston cell..
Image
Last edited by Hillhater on Jul 13, 2017 8:52 am, edited 1 time in total.
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Re: boston swing 5300 battery 3000 cycles

Post by grindz145 » Jul 13, 2017 8:39 am

The key questions to ask are:
1. 3000 cycles at what charge rate
2. 3000 cycles at what voltage (IE 4.15/4.25 etc)
3. 3000 cycles at what discharge profile/temperature (less important) how much actual capacity is usable

It's not hard to get 3000 cycles out of even old LiMn cells so long as the charging voltage is sufficiently below surface charge, and reduced capacity.

I'd like to see the actual datasheet but the Boston Power site seems to be down at the moment.

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Re: boston swing 5300 battery 3000 cycles

Post by Hillhater » Jul 13, 2017 8:55 am

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Re: boston swing 5300 battery 3000 cycles

Post by hemo » Jul 14, 2017 3:52 am

BGA Reworking aka Insat Intl in London use Boston 5300's a lot, they are very hard to weld to but they manage now with their state of the art 30k welder. Equivalent in size/weight to a pair of 18650's so theoretically a 2750mah single cell size. They are designed for industrial or heavier vehicle platforms as their actual use is in premade expandable modular systems which in them selves are very expensive with no welding involved.

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peleap
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Re: boston swing 5300 battery 3000 cycles

Post by peleap » Jul 14, 2017 7:53 am

hemo wrote:BGA Reworking aka Insat Intl in London use Boston 5300's a lot, they are very hard to weld to but they manage now with their state of the art 30k welder. Equivalent in size/weight to a pair of 18650's so theoretically a 2750mah single cell size. They are designed for industrial or heavier vehicle platforms as their actual use is in premade expandable modular systems which in them selves are very expensive with no welding involved.
thank you information cell Batteries will only be used with certain items.

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Re: boston swing 5300 battery 3000 cycles

Post by scrambler » Sep 16, 2017 4:10 pm

They also have assembly modules for no weld power packs that sound interesting
http://www.boston-power.com/products
http://www.boston-power.com/sites/defau ... nglish.pdf
http://www.boston-power.com/sites/defau ... nglish.pdf

There is apparently a new clone of the Vector bike coming out with a 3kWh battery based on it.
https://delfastbikes.com/
Specs were obtained by someone on the EBR forum
https://electricbikereview.com/forum/th ... rge.14482/

Note: I found this article about comparing a 2 x 18650 cell module with the BP single cell
http://ltmsales.com/two-liion-18650-cel ... -solution/
http://www.boston-power.com/products/technology

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Re: boston swing 5300 battery 3000 cycles

Post by Alex Imreh » Nov 21, 2017 2:32 am

Why not use this? First it is new for many, and produced in China, so many will trust more brand cells like Samsung, LG and so on.
Second it is 13A max continuous discharge, that is like 6.5A discharge for a 18650 cell. For big engines that is not enough, it could be enough for big packs used with relatively small engines.
Reasons to use this cell - 1# price lower than brand 18650 cells, 2# longer life, 3# less problems with temperatures. As usually price is most important issue for growing sales, so in the end this cell could be a good choice for popular ebikes, for models like the project "with Vector copy" that was able to pass the big Kickstarter test. And by the way, those are not copy frames, the real producer of the frames is not in Germany.
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