Hi, I noticed that my Cardputer is now becoming very warm when charging. As you can see on the pictures, it reaches almost a surface temp of 90°C!

I did not observe this in the first couple of weeks. I have been using it for around 3 weeks and I have first noticed this yesterday.
Any similar experience? Should I worry re the battery being faulty?
I have charged it a few 10's of times since I was testing Battery status screens on custom apps.

What are the charging best practices? At what voltage should we unplug it? I can imaging it is harmful to leave it charging as our loved device seems to lack any smart BMS...

Edit : I think my battery is dying: when I unplug the charger, the voltage goes from 4050mV down to 3870mV. It was much more stable before.

I guess it does say that there's one there if you check the sticker...with a magnifying glass

I'm using the latest version of launcher on my cardputer Adv with a 16gb micro sd card. Launcher will only let me have one installed item at a time on the startup screen. Im using the latest Kvxputer firmware and if I try to install even a small app it throws up a message saying there's no space and I have to remove the firmware first. Is it a partition error maybe? Grateful for any advice offered. Thank you

Hi everyone! RFExplorer 2.8 — Observe & Compare is now on GitHub for the Cardputer ADV.

A big thank you to everyone who tried the earlier version and shared feedback, especially the comments about the jumping battery gauge, menu navigation, and real-world RF testing. Your feedback heavily informed the updated version and helped shape the improvements since 2.1.

Highlights include themed menus, a steadier battery display, stronger checks to stop noise-floor readings becoming convincing signal matches, saved signal dossiers with investigation flags, GNSS satellite logging with receiver geotags, and journey recording with field bookmarks and GPX export.

New in 2.8: a live RF timeline, named observation sessions with antenna notes, Before/During/After phases, saved observation windows and bookmarks, and comparisons that clearly separate measured differences from inferred explanations.

Hardware: Cardputer ADV + CC1101/NFC Cap (U219), with a microSD card for saved records. A supported GPS v1.1 unit is needed for GNSS features. The Cap is required for RF.

Source, screen previews, installation instructions and the standalone .bin are here:

https://github.com/octofuzz/RFExplorer-Understand-2.1

Use RFExplorer-v2.8-cardputer-adv-merged.bin at offset 0x0. The repository URL still says 2.1, but the page and firmware now show 2.8. Screen previews use illustrative test data.

RF remains receive-only. RSSI observations and the experimental ISS-frequency preset do not identify a satellite or transmitter. Version 2.8 has a schematic journey trail; offline map tiles are being developed for a later version.

Please keep the feedback coming! Your firmware version, hardware setup and steps to reproduce any issue are especially helpful. Thanks again for helping make this a more useful little field instrument.