[chbot] LiPo 1200mAh 3.7V

[Stephen Irons]

Thank you. I did not even think of Trademe.

I am following up a few leads from others on the group.

One thing that suddenly became clear is that the 6-digit number on 
these Lipos gives its dimensions, just like '18650' gives the dimension 
of that cylindrical cell. For rectangular cells, the format seems to be
'TTWWLL' where
TT is thickness in 0.1 mm unitsWW is width in 1 mm unitsLL is length in 
1 mm units
So my one is 603450 -> 50 x 34 x 6.0 mm.

That one on Trademe one is 903052 -> 52 x 30 x 9.0 mm.

We might have to redo our 3D printed mount to fit this size.

I can install JST terminals, and can probably change 2.54 mm to 2 mm 
spacing just by changing the housing, with redoing the crimping, so not 
too fussed about the connector.

Stephen Irons



On Fri, Jul 31, 2020 at 16:40, Mark Atherton <markaren1 at xtra.co.nz> 
wrote:
> Trademe "1200maH" found this
> 
> <https://www.trademe.co.nz/Browse/Listing.aspx?id=2721904869>
> 
> as almost the first item. Not quite what you are looking for but 
> maybe a way to find something locally ?
> 
> -mark
> 
> 
> On 31/07/2020 3:51 PM, Stephen Irons wrote:
>> I am looking for a few (2--5) LiPo batteries, around 1200 mAh 3.7 V 
>> with 2 mm JST connector, size about 50 x 35 x 7 mm.
>> 
>> The BOM calls for 
>> <https://nicegear.nz/product/lithium-ion-polymer-battery-1200mah> 
>> but they are out of stock with no ETA -- they seem to be tricky to 
>> bring into the country at this time.
>> 
>> Spare lithum cells seem tricky to buy from overseas. We buy AA 
>> Li-ion batteries in pairs inside cheap-as torches (and throw away 
>> the garbage housing) so they are shipped as consumer items, rather 
>> than spare batteries. But I have not found an off-shore source for 
>> these LiPos in a consumer device.
>> 
>> I have looked at a few online hobby shops -- drones often use small 
>> lipos -- but have not had any success.
>> 
>> Fairly urgent (10--14 days is when other offshore items are 
>> arriving), and I am happy to pay for DHL or similar shipping, but 
>> if they are really not available in NZ, we will have to think of an 
>> alternative.
>> 
>> Does anyone have any suggestions?
>> 
>> Stephen Irons
>> 
>> 
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