4S LiPo Battery Value and Capacity Comparison

Flight time depends mainly on the drone weight. In order to get flight times above 1 hour on a single charge (as shown here), the weight has to be minimized. Typically the most dominant weight hereby is the battery. To identify the best battery I created a 4S LiPo Battery Value and Capacity Comparison.

  • Value can be calculated by Capacity / Price)
  • Density can be calculated by Capacity / Weight

The diagram above is sorted left to right by Ranking = Cap /Weight * Cap /Price

See also 6S LiPo Battery Value and Capacity Comparison.

Raspberry Pi 3B+ Enclosure 3D Model

The 3D model of the Raspberry Pi 3B is hosted on Thingiverse. This page contains the bill of material, in case you want to build a similar setup.

Cloud Server

The above setup is used for a Nextcloud setup. Nextcloud is a self-hosted productivity platform and allows you to host your cloud data such as pictures of your phone yourself.

It is a full replacement for DropBox and Google Drive for me, with the benefit of protecting my privacy. Additional features enable video chat and many other fun things.

The installation script can be found on Github.

Backup Server

The above setup is used for a backup server which regularly backs up all Raspberry Pis in a rolling backup on a daily and monthly basis. The installation script can be found on Github.

I have several PIs installed in my home. One of them acts for example as Nextcloud server and resides in a DMZ.

In such a setup, servers pushing into the private zone pose a security threat. To overcome this, another server/PI resides in the private zone and cyclically pulls the data such as pictures and logs in.

The backup PI uses CRON jobs and scripts to do a backup every day and month. It hereby keeps data for 12 month in a rolling backup.

Bill of Material

AmountDescriptionLink
1 1TB HDD Amazon
1 Hard Drive Adapter Amazon
1 Raspberry Pi 3 Amazon
1 Memory Card Amazon
1 Power supply Amazon
1 Y-Cable Extension Amazon
1 #4×1/2 Pin Head Phillips Zinc Screws HomeDepot
1 #4×3/8 Pin Head Phillips Zinc Screws HomeDepot

Not used by me but recommended in setups with a fan: Nocturna Fan or WINSINN  Fan.

If you don’t need a hard drive, you might find this case attractive as it includes a fan already.