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Battery thickness problems & Ebay sellers

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Battery thickness problems & Ebay sellers

Postby Coughinhk » November 5th, 2011, 6:12 am

Hi,

Just a heads up for anyone out there buying batteries from Ebay. The batteries are supposed to be 7.28mm thick but the ones I got are over 8mm and don't fit.

The seller is fmt-model : obviously too cheap.

http://www.ebay.co.uk/itm/300530740837? ... 029wt_1037

Maybe we can keep a list of sellers who have batteries that are out of spec ?

Cheers,
Tom
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Battery thickness problems & Ebay sellers

Postby amb » November 5th, 2011, 6:21 am

The picture of the battery in the eBay listing looks exactly like the ones I'm using (with identical markings). Do the actual batteries you received match the picture?
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Re: Battery thickness problems & Ebay sellers

Postby MisterX » November 5th, 2011, 8:53 am

How much over 8mm?
The Hammond 1455C801 datasheet sez the distance from the top of the bottom slot to the top of the inside of the enclosure is 16.15mm.
I measured the distance between the top of a Mini3 board inserted into the bottom slot and the top inside of 8 enclosures.....
The worst one measured 16.46mm.

Maybe you have a smooshed case?
(which wouldn't surprise me)
1352.5 and counting.
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Re: Battery thickness problems & Ebay sellers

Postby MiniMe » November 5th, 2011, 11:51 am

>Maybe you have a smooshed case?

I've run through more than a few 802's and there can be a wide variation in the center line measurement of the opening. You can pry it open a little, however.
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Re: Battery thickness problems & Ebay sellers

Postby Coughinhk » November 5th, 2011, 6:25 pm

Hi

My case has a clearance of just under 17mm. The batteries seems to be fine until the yellow band near the cable, where they are just under 9mm thick each - almost 18mm stacked. So the two thin ends go in fine but the batteries stick about halfway in. There's no way to finesse this because of cable length etc - just have to remove some of the battery wrappings I guess ?

Cheers

Tom
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Battery thickness problems & Ebay sellers

Postby amb » November 5th, 2011, 8:24 pm

I would not remove any battery wrapping... Not safe.
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Re: Battery thickness problems & Ebay sellers

Postby MisterX » November 5th, 2011, 8:56 pm

It's not very thick either so......
1352.5 and counting.
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Re: Battery thickness problems & Ebay sellers

Postby Coughinhk » November 6th, 2011, 12:24 am

Hi,

I went to the RC model shops here and found 3 with these batteries. The markings on each were slightly different so it seems likely they came from different factories but all had the same problem as the ones I have.

I found a dual pack and that fitted but it was 1000mah and was just a little too long. So it seems likely that this is not an isolated problem and Ebay won't be an easy place to find batteries that fit. The 350mah batteries fit, but then, what's the point.

So where did you guys get your batteries ?

I have tried squeezing open the case but it makes no significant difference as the batteries are not centrally located. I have 3 cases - all have the same problem too. No variation in sizes with mine.

So, I think the best solution is going to be grinding off some of the mini3 board in the appropriate place if no-one can think of anything else ?
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Re: Battery thickness problems & Ebay sellers

Postby MisterX » November 6th, 2011, 1:37 am

The 350mah batteries fit, but then, what's the point.


The points are faster re-charging, a LED status indicator that actually tells you something other then an AC adapter is connected, not constantly charging the battery if the AC adapter is left connected to the amplifier, a protection circuit that will prevent the battery from revering polarity because it has been over-discharged and lower battery replacement cost.



So where did you guys get your batteries ?


I have bought them from multiple sources and I have not yet found any that will not fit.


Try these and see if you have the same problem----------->
http://www.ebay.com/itm/180721440670
1352.5 and counting.
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Re: Battery thickness problems & Ebay sellers

Postby amb » November 6th, 2011, 1:48 am

Coughinhk wrote:I went to the RC model shops here and found 3 with these batteries. The markings on each were slightly different so it seems likely they came from different factories but all had the same problem as the ones I have.

Weird. MisterX is has built a number of these now and there is no fitment problem. The batteries fit snugly, but they do fit... I don't know what to tell you.

So where did you guys get your batteries ?

Mine came from ebay. I took a sample of five of them and measured the thickness of each, right over the orange stripe. They are (in mm): 8.03, 8.09, 8.00, 8.07, 8.06, 7.99. There is a fair margin of error in these numbers because the battery pack is a bit "soft" and will give when pressed with the caliper. But that also means the two stacked batteries should squeeze into the case without too much trouble...

The pic on the χ1 website with the batteries in the case is real. :)

So, I think the best solution is going to be grinding off some of the mini3 board in the appropriate place if no-one can think of anything else ?

Note there are some traces on the bottom near the battery area.
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