sudomod

Hello guys, I've been seeking for around the internet and couldn't find a website that ships to Spain, not even Ebay and Amazon. I can't assume the shipment costs of Adafruit. I'm looking for a 2500maH (like the adafruit battery). If you know some other battery with similar capacity or superior that fits with GB case I will thank you

marketus wrote:Hello guys, I've been seeking for around the internet and couldn't find a website that ships to Spain, not even Ebay and Amazon. I can't assume the shipment costs of Adafruit. I'm looking for a 2500maH (like the adafruit battery). If you know some other battery with similar capacity or superior that fits with GB case I will thank you

Do you have an R/C hobby shop near you? They might sell batteries for helicopters that may suit your needs.

mmm good idea!! I'll go tomorrow

I'm seeing someones in alibaba but I don't trust the quality of that batteries, the PCM circuit I mean...

https://www.alibaba.com/product-detail/ ... .67.uUaaTm

marketus wrote:mmm good idea!! I'll go tomorrow

Just remember you want 3.7v Lipo/Li-ion batteries capable of about 2.1A max draw with onboard protection. Normal RC helicopter batteries will probably blow up your Pi by giving it too much current, since it normally powers DC motors.

jb32647 wrote: Normal RC helicopter batteries will probably blow up your Pi by giving it too much current, since it normally powers DC motors.

Uhhhh...
That's not how power and current works.
A power supply doesn't 'push' current. Devices 'draw' it

Analogy time
If you have a water supply, your supplier is providing it to you with a certain pressure. Consider the pressure to be voltage. Kind of fixed. (it's not constant but it's close enough for this analogy.)
When you open your tap/faucet, the water flows at a certain rate. That is the 'current'. Your pipes and the amount you open the tap and the pressure govern what the flow rate is at any given time.
Likewise, it's the components in a circuit that control what the current is, not the supply battery. The battery just has the capacity and capability to provide it.
So if your pi and accessories draw a total of 3A and your battery can provide 4A, then that's just spare capacity and longer run time. It's when your components draw more than the battery can supply that you start to get problems.

Usually, RC batteries are designed for high current draw so in general are fine for allowing plenty of amps. They don't usually have protection though

abrugsch wrote:

jb32647 wrote: Normal RC helicopter batteries will probably blow up your Pi by giving it too much current, since it normally powers DC motors.

So if your pi and accessories draw a total of 3A and your battery can provide 4A, then that's just spare capacity and longer run time. It's when your components draw more than the battery can supply that you start to get problems.

Usually, RC batteries are designed for high current draw so in general are fine for allowing plenty of amps. They don't usually have protection though

Ahh, sorry, for some reason I had it in my head that OP would also use the power supply for a helicopter too, which are about 11-15v, rather than the Pi's 5v.

Ah right. Well you mentioned current not voltage. With any battery you need to do voltage conversion/conditioning anyway, as the rated output tends to be variable. i.e. 3.7V LiPo's actually range from ~3v to 4.2V per cell, hence the powerboost to take it to a clean 5V. If you have a battery that needs bringing down to 5V you need a buck converter. So yeah, RC batteries tend to be multiples of the 3.7V. either way you need to convert to a stable 5V though

marketus wrote:Hello guys, I've been seeking for around the internet and couldn't find a website that ships to Spain, not even Ebay and Amazon. I can't assume the shipment costs of Adafruit. I'm looking for a 2500maH (like the adafruit battery). If you know some other battery with similar capacity or superior that fits with GB case I will thank you

https://www.aliexpress.com/item/Dual-ha ... 325.RQqtuD