Bose SoundLink Mini 1 Buck Converter Modification: Roadblocks

Hello everyone, I'd like to inquire regarding the previous solution given by another user in another blog

In short, OP bought a 12VDC to 7.5VDC buck converter, gutted the battery, then connected the output to the respective pins onto the battery base, which was then attached. The input used was the original wall plug included with the speaker, wired through the charging dock.

So I bought an LM2596 buck converter with a display to set the output voltage, looks just like the image I have attached, and then set it to 7.5 volts

I then wired everything just like OP did, and the speaker did actually boot up and connected to bluetooth. However, it would just shut down after about a minute of playback. I've tried it several times, also tried to factory reset it by holding the mute button, but it would still power off after about 1 minute of playback. When it powers off, I'm not able to turn it back on until I unplug and replug the whole circuit again (I'm using the original wall plug included with the speaker).

Does anyone have a solution for this? A replacement battery is quite expensive for me so this seemed like a really good solution.

For reference, this is the original post: https://www.eevblog.com/forum/repair/mod...

I'd also like to add that when the circuit it plugged in but not turned on, after the same time it would take to shut off (1 minute) the battery icon would start flashing red.