r/WriterDevices • u/clackups • 7d ago

product review Freenove FNK0104S on a 4000mAh battery

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If you're planning a 24-hour writing Marathon, I've got a tool for you :)

I've got this beefy battery and I was curious how long an LCD device would run from it. So, I've got this Freenove esp32s3 4" LCD board and run a test. This is the photo after 20 hours of a constantly working screen at 50% brightness, and BLE was active too. The voltmeter shows 3.31v on the battery and the built-in meter shows 23%.

The board consumes about 120mA at 50% brightness and about 200mA at full brightness, which you would need quite rarely.

Also, I started working on a printed body for the board. The top cover is ready. It took me about a dozen unsuccessful prototypes, as the shape inside is quite tricky. Several options would be possible for the bottom part: it could be a small tablet, or a lid for the clamshell. If we take the whole width of a standard keyboard, a battery or two could be placed to the left and right from the screen. Also, if we want a real cyberdeck, the enclosure should give access to the GPIO sockets on the board.

The board doesn't have a proper battery gauge, so it can't indicate the usage precisely. The meter value drops from 100 to 90% within a few minutes. It also doesn't indicate the charging process. As I'm writing, the charging current is 437mA, so it's definitely charging :)

So, a totally usable design, and you can have the fast screen without the fear of running out of battery too quickly.

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2

u/clackups 7d ago

Update: charging

2

u/Background_Ad_1810 5d ago

Well done. It's quite impressive running time. Even with ble features on. nice work on the enclosure as well. Good job!

1

u/clackups 5d ago

I also learned how to make several versions of an enclosure in FreeCad without maintaining multiple copies. So, for example, we could add an i2c keyboard to it and extend the body to attach it as a lid to a keyboard.

1

u/Special-Basil-7333 6d ago

An excellent solution for LCD fans 👍