KanoMaster22
Posts: 168
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Best Small Cheap Way To Power A Pi

Thu Jan 18, 2018 5:43 pm

Could anyone recommend me some cheap lipo batteries with a capacity of 3000mAh+. By cheap I mean around £8. Thanks for any help in advance, LouisP

Edit: They don't have to be lipo batteries as long as the batteries are 3000 mah+, under £10 and 120mm x 100mm or less.
Last edited by KanoMaster22 on Thu Jan 18, 2018 7:07 pm, edited 1 time in total.

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davidcoton
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Re: Best Cheap Lipo Batteries For Pi

Thu Jan 18, 2018 5:44 pm

I would not recommend cheap LiPos under any circumstances.
"Thanks for saving my life." See https://www.raspberrypi.org/forums/viewtopic.php?p=1327656#p1327656
“Raspberry Pi is a trademark of the Raspberry Pi Foundation”

PiGraham
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Re: Best Cheap Lipo Batteries For Pi

Thu Jan 18, 2018 5:49 pm

Don't use bare LiPos. Always use protection circuit and proper charger. USB power packs can be good value.

I bought one of these as a gift for some one. Seemed well made and I haven't heard any complaints but I can't tell you much about it.
https://www.amazon.co.uk/TeckNet-Portab ... power+pack

£12.99

KanoMaster22
Posts: 168
Joined: Wed Oct 05, 2016 6:06 pm

Re: Best Cheap Lipo Batteries For Pi

Thu Jan 18, 2018 5:50 pm

Thanks for the quick reply. What would the best choice be for a cheap very compact battery pack for the pi then? Thanks for any further help,
LouisP

KanoMaster22
Posts: 168
Joined: Wed Oct 05, 2016 6:06 pm

Re: Best Cheap Lipo Batteries For Pi

Thu Jan 18, 2018 6:02 pm

Power banks are definitely good value for money and a good way to power a Pi but are either too thick or too big for the project I have in mind.

PiGraham
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Re: Best Cheap Lipo Batteries For Pi

Thu Jan 18, 2018 6:34 pm

KanoMaster22 wrote:
Thu Jan 18, 2018 6:02 pm
Power banks are definitely good value for money and a good way to power a Pi but are either too thick or too big for the project I have in mind.
I was trying to answer the question you asked. You haven't told us anything about size or shape requirements or what you are trying to do.
Something else you should define is what battery life you are hoping for because that has a lot to do with size.

KanoMaster22
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Joined: Wed Oct 05, 2016 6:06 pm

Re: Best Cheap Lipo Batteries For Pi

Thu Jan 18, 2018 7:04 pm

Sorry Graham. I am looking for a battery around 120mm x 100mm. I am looking for 3000 mah+ battery life.

wh7qq
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Joined: Thu Oct 09, 2014 2:50 am

Re: Best Small Cheap Way To Power A Pi

Thu Jan 18, 2018 8:02 pm

Lipos are pretty darn cheap as it is, considering life span, current density and so on. I don't think you save enough with "cheap" to make it worthwhile. Panasonic 18650 batteries have served me well in high-drain flashlight applications and they cost about $7 US each. If they are good enough for Tesla, I can't compete with their research. Current ratings are all over the map because there seems to be no standard test conditions and that makes all the difference. You do need to invest in a quality charge controller with a hard cutoff and well controlled current. Still, sleeping with a phone under your pillow is a good definition of insanity, with or without protection circuits.

If you ever had to put up with the short life-span of NiCads...they were really a rip off. Battery powered drills and other tools were a bad joke. The batteries would crap out in short order and replacements cost as much as a new drill. I have had an LG flip-phone since before Noah's flood and it's lipo is still trucking. Even the original lithium pack on a Compac Presario sold just before the turn of the century was still good until a few years ago. The cost of a battery or pack is nothing compared to the cost of the circuitry it drives and the time and effort that went into the project.
Sent by WH7QQ from an RPi3/Raspbian/pixel desktop.

mattmiller
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Re: Best Small Cheap Way To Power A Pi

Thu Jan 18, 2018 8:56 pm

If you ever had to put up with the short life-span of NiCads...they were really a rip off.
NiCads - you were lucky - we used to dream of owning NiCads .....

Or in other words - they were the VFM rechargeable solution of their time

PiGraham
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Location: Waterlooville

Re: Best Cheap Lipo Batteries For Pi

Fri Jan 19, 2018 9:26 am

KanoMaster22 wrote:
Thu Jan 18, 2018 7:04 pm
Sorry Graham. I am looking for a battery around 120mm x 100mm. I am looking for 3000 mah+ battery life.
2AH and smaller:
Read the safety info!
https://shop.pimoroni.com/products/lipo-battery-pack

You should look at the WH capcity of a battery rather than mAH. A mAH number will typically be at the single cellvoltage rather than the pack voltage so 3000mAH probably means 3000 mA x 3.7V = 1.11 WH

https://www.adafruit.com/product/354
Two 3.7V cells in parallel, 4,400mAH (16WH)

KanoMaster22
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Re: Best Small Cheap Way To Power A Pi

Fri Jan 19, 2018 1:22 pm

Thanks for the replies. The 18650 batteries look like good value and capacity. Also, the lipo batteries are good value and capacity as well. However, I heard connecting lipo batteries in parallel is dangerous. I will probably opt for the 18650 batteries as they can easily be bought and need less protection.

PiGraham
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Re: Best Small Cheap Way To Power A Pi

Fri Jan 19, 2018 4:50 pm

KanoMaster22 wrote:
Fri Jan 19, 2018 1:22 pm
Thanks for the replies. The 18650 batteries look like good value and capacity. Also, the lipo batteries are good value and capacity as well. However, I heard connecting lipo batteries in parallel is dangerous. I will probably opt for the 18650 batteries as they can easily be bought and need less protection.
AFAIK 18650 cells reuire just the same protection asany LiPO. As with other packages some 18650 have protection built in and some don't and you definitely need protection circuits.

Here's one with protection built-in that you can rely on
https://uk.rs-online.com/web/p/products/8801558

Here's an unprotected type that might burn your house down unless you add a protection circuit and use a proper charger.
https://www.banggood.com/1pcs-3_7V-6000 ... 12976.html

Buy a complete pack with however many cells you need and protection integrated.

KanoMaster22
Posts: 168
Joined: Wed Oct 05, 2016 6:06 pm

Re: Best Small Cheap Way To Power A Pi

Sun Jan 21, 2018 5:31 pm

Thanks again, those ones from RS look perfect! Will be buying them. I meant protection as in it is harder to bend, crush and puncture 18650s but protection circuit built-in looks like a good idea.

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