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R2-D2 Battery Information Options
Tomick
#21 Posted : 03 December 2018 16:27:08
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darbyvet wrote:
Will there be a USA source for the batteries? it would be difficult to get them shipped from UK.


Carl


A few months before completion in the US but MS is on it Cool
coldsweat
#22 Posted : 03 December 2018 16:27:55

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Just a quickie to the electronic engineers here?

The spec states that the batteries should have a voltage of 3.7v, however in issue 92, the specs state that cells should charge to 4.2v with a minimum voltage of 3.0v

This means that the nominal voltage should actually be 3.6v (as 3.7v cells charge up to 4.35v)

So which is correct - the stated maximum voltage of 4.2v or the stated nominal voltage of 3.7v as it can't be both!
figuerres
#23 Posted : 03 December 2018 17:06:50

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coldsweat wrote:
Just a quickie to the electronic engineers here?

The spec states that the batteries should have a voltage of 3.7v, however in issue 92, the specs state that cells should charge to 4.2v with a minimum voltage of 3.0v

This means that the nominal voltage should actually be 3.6v (as 3.7v cells charge up to 4.35v)

So which is correct - the stated maximum voltage of 4.2v or the stated nominal voltage of 3.7v as it can't be both!


from what i know the batteries have a range of voltages they will hold on the first few charges and over time they will get slightly lower as they get older.

all LiOn cells have that happen, most folks only know they work or they get to old and you get new ones.

so the 3.6 to 4.2 Volts kind of range is not huge and is normal, that is why they are generaly sold as "3.6V" cells so that they should stay at or above 3.6V for the majority of the life of the cell.

the board that interfaces them to the R2-d2 will give the r2 good power as long as the cells are in that range.

what they have been stressing here in the post from the staff is that we get a batch that all have the same spec and that the initial charge be as close to the same on all cells as possible. that way the charger will not be massively over or under charging some cells.

i hope that helps, i think what i just wrote is right based on what i know about this.
notsram
#24 Posted : 05 December 2018 13:09:15

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The user guide is apparently arriving later today, according to a post on another part of the forum.

But yeah, pretty pathetic that there's still no battery info or real news on the app. All very well telling us to be patient, but considering the amount of money we've all spent on this thing, and that they've had two years to get the final bits and pieces ready, it's a real slap in the face to be told that we have to wait to properly use R2...
sapper
#25 Posted : 05 December 2018 16:27:25

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Can anyone give me a link to a reputable supplier in the UK. I am having great difficulty in getting the correct one's. The one's I have found so far only supply the flat top, not the one's with the raised button. Awaited issue 100, but no link to where to buy the batteries, also, no link to the smartphone app. The one's I have found don't seem to relate to the model we have all just been building. Thanks.
Tomick
#26 Posted : 05 December 2018 16:38:11
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sapper wrote:
Can anyone give me a link to a reputable supplier in the UK. I am having great difficulty in getting the correct one's. The one's I have found so far only supply the flat top, not the one's with the raised button. Awaited issue 100, but no link to where to buy the batteries, also, no link to the smartphone app. The one's I have found don't seem to relate to the model we have all just been building. Thanks.
Issue 100 says to visit www.buildr2d2.com (within The Build tab) which is where the full User Guide can be found and the App info and Battery info will be posted once DeAgostini have posted them.

I am awaiting further update regarding both.
Mattyhg
#27 Posted : 05 December 2018 22:38:21

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Will there be a full guide, like a full index on the build, help section if certain parts are not working, etc?
Tomick
#28 Posted : 05 December 2018 23:12:57
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Mattyhg wrote:
Will there be a full guide, like a full index on the build, help section if certain parts are not working, etc?
See this topic
https://forum.model-spac...amp;m=298172#post298172
Michaeljf1980
#29 Posted : 06 December 2018 14:33:52

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These are the batteries I have purchased, are these ok ? https://eu.nkon.nl/sanyo-18650ga-button-top.html
Tomick
#30 Posted : 06 December 2018 14:44:29
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Michaeljf1980 wrote:
These are the batteries I have purchased, are these ok ? https://eu.nkon.nl/sanyo-18650ga-button-top.html
Unless I missed it, I can’t see any mention of unprotected?
coldsweat
#31 Posted : 06 December 2018 14:48:37

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Michaeljf1980 wrote:
These are the batteries I have purchased, are these ok ?


These seem to be protected, so are unsuitable.
semaj
#32 Posted : 06 December 2018 14:51:37

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Tomick wrote:
[quote=Michaeljf1980]These are the batteries I have purchased, are these ok ? https://eu.nkon.nl/sanyo-18650ga-button-top.html[/quote] Unless I missed it, I can’t see any mention of unprotected?

They look like protected cells to me. They have the extra ridge at the positive end which is where the protection circuit is usually located
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Michaeljf1980
#33 Posted : 06 December 2018 15:03:50

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It’s at the bottom of the page, under additional information
Tomick
#34 Posted : 06 December 2018 15:09:26
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Indeed it does say unprotected in the spec but the photo seems to be that of a protected cell. Might be worth an email to confirm 100%
figuerres
#35 Posted : 06 December 2018 15:24:36

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its really amazing just how this battery has so many versions but they all refer to it by one common number!!!

also it seems like 95% of the "button top" are also "Protected"
and about 95% of the "flat top" are "Unprotected"


*IF* they had went with flat top i think this battery thing would be less of a hassle.


the only tiny gain is in identifying the + / - ends of the cell i think....

semaj
#36 Posted : 06 December 2018 15:44:39

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The number 18650 denotes the size of the battery - 18mm diameter, 65.0mm long. And yeah it is super confusing with all the different varieties - protected, un protected, button/flat/nipple top, different power (amp) ratings, different capacity (mah). Total minefield. And not all of them even meet anywhere near the specified capacity or power ratings. Some brands are utterly dreadful. As a rule of thumb, if its advertised anything over around 3500mah then its an utterly false claim, as the tech doesnt exists to make them any higher than this. Also, generally, the higher the mah, the lower the power rating tends to be. What makes things more confusing is they give 2 power ratings - max continous and max pulse. Continuous is what we need to be looking at.
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Michaeljf1980
#37 Posted : 06 December 2018 15:45:26

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Tomick wrote:
Indeed it does say unprotected in the spec but the photo seems to be that of a protected cell. Might be worth an email to confirm 100%


I’ve just rang the company I’ve ordered them from, he has told me they are definitely unprotected cells
mjluk
#38 Posted : 06 December 2018 20:50:14

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I am struggling to find the batteries.
jennings74
#39 Posted : 06 December 2018 20:56:39

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mjluk wrote:
I am struggling to find the batteries.


Ditto and I work for a company that sells button top protected batteries!!Cursing
figuerres
#40 Posted : 06 December 2018 21:23:52

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i think this site and link may be the right ones for us:
https://www.18650battery...sung-30q-button-top.htm

Samsung 30Q 18650 3000mAh 15A -Button Top Battery - INR18650-30Q

Specifications:
Model: INR18650-30Q
Size: 18650
Style: Button Top
Chemistry: INR
Nominal Capacity: 3000mAh
Continuous Discharge Rating: 15A
Pulse Discharge Rating: 25A
Nominal Voltage: 3.6V
Protected: No
Rechargeable: Yes
Approximate Dimensions: 18.42mm x 66.64mm (+1.80mm vs flat top version)
Approximate Weight: 48.5g
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