500,000mah Power Bank, even though it's much less than expected...... so the question is.....

[MarkIpswich]

Feel free to move if this is in the wrong section.

I brought one of these recently,

https://www.ebay.co.uk/itm/500000mAh-Power-Bank-Backup-LED-Portable-Battery-Charger-For-All-Moblie-Phone/174045226129?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

however the % goes down much quicker than expected. I haven't looked at the batteries yet but is there anyway I can make it 500,000mah (if they really and truly are) using one of those battery holders?

 

[MarkIpswich]

Yup in that form factor won't be much more than about 20,000mah if it is a good product or a little more if using expensive cells.

At £12 I'd be surprised if its much over 5000 real capacity let alone 500000.

Without some electronics experience modifying li-ion charging is not a trivial task.

Got any sites where I can find the instructions on how?

I'll be using it via Raspberry PI 3 Model B+ with output of 2.5a, though it does require a minimum of 2.0 I do believe.

 

[MarkIpswich]

I did look for some 20,000 / 30,000mah lithium batteries but unable to find any.

Do you know where there are some available to buy?

 

[MarkIpswich]

How many of them do I need to make 30,000mah?