Consider redesign board for CR2477 or CR2450 battery instead of CR2032?

[Hedda]

Suggest re-design board with battery-clip/battery-holder/battery-retainer for CR2450 or CR2477 batteries instead of CR2032 batteries?

• CR2477 is 24 x 7.7 mm in size and usually has about 1000 mAh of capacity on average.
• CR2450 is 24 x 5.0 mm in size and usually has about 550 mAh of capacity on average.
• CR2032 is only 20 x 3.2 mm (coin cell size) but only has 200 mAh average capacity.

Alternative universal solder pads supporting fitting battery-clips/battery-holders/battery-retainers for either CR2477, CR2450, or CR2032?

I think that it might be possible to find a cleverly designed battery-clip/battery-holder/battery-retainer for CR2477 that could even be able to hold either a CR2477 or a CR2450 or even two CR2032 batteries stacked on top of each other, or what do you think?

Example:

MYOUNG MY-2477-02 (Mfr. Part # MY-2477-02 LCSC Part # C2979175) https://lcsc.com/product-detail/Battery-Connectors_MYOUNG-MY-2477-02_C2979175.html

MYOUNG MY-2477-01 (Mfr. Part # MY-2477-01 LCSC Part # C2979173) https://lcsc.com/product-detail/Battery-Connectors_MYOUNG-MY-2477-01_C2979173.html

MYOUNG MY-2450-01 (Mfr. Part # MY-2450-01 LCSC Part # C964845) https://lcsc.com/product-detail/Battery-Connectors_MYOUNG-MY-2450-01_C964845.html

Reference:

https://jeelabs.org/2015/07/29/could-a-coin-cell-be-enough/index.html

FYI, CR2450 and CR2477 are also relativly inexpensive and commonly available almost everywhere today, and a 10-pack of either CR2450 or CR2477 costs less than $10 US-dollar now so please do not let price per battery play a major role in your decision, see these examples:

https://www.google.com/search?q=CR2450&tbm=shop

https://www.google.com/search?q=CR2477&tbm=shop

https://www.amazon.com/s?k=CR2450

https://www.amazon.com/s?k=CR2477

https://www.amazon.de/s?k=CR2450

https://www.amazon.de/s?k=CR2477

PS: I personally hate to replace batteries so really looking to get a large battery capacity and a long time between replacements.

[Pferdebockwurst]

Good idea, I second this! Isn't it already possible to solder a different battery holder with the current design of the board (b-parasite)?

[stanvn]

It looks like they have the same footprint indeed, so it should be possible to solder the CR2477 and CR2450 battery holders on the b-parasite. But be careful not to stack two CR2032 on top of each other because this will double the voltage and the nRF52840 will probably break.

With the CR2032 a battery live of 600 days is already possible which is plenty in my opinion. Using larger batteries will increase the size and cost.

[stanvn]

I'll close this issue with the solution that you can simply solder a CR2450 or CR2477 battery holder onto the board. The code does not need to be changed for this because the discharge curves are the same for all (see #4).

[Hedda]

I'll close this issue with the solution that you can simply solder a CR2450 or CR2477 battery holder onto the boar

@stanvn soldering might not be possible now, but please see and consider the suggested compromise solution by nielsfaber:

Originally posted by @nielsfaber in https://github.com/rbaron/b-parasite/issues/55#issuecomment-1322383221

I agree with the proposal of @Hedda

CR2032 clip footprint (the one that is recommended):

CR2450 clip footprint (random one from aliexpress):

By increasing the spacing between the solder pads for the sides to approx. 25mm, and leaving some clearance next to the pads for the bigger clip, it would allow both versions to be soldered.

I would like to see this updated in the project. Users can choose which version they want to make, only the case would be different (CR2450 battery is 24.5mm wide, so will be wider than the PCB).

(I don't have+know KiCad otherwise I could submit this change myself)