Some old Laptop battery. You can reuse the cells for plenty of other applications.
MPPT Solar Controller Regulator Dual USB with QC 3.0 DIY Solar Charger Quick chargeJune 4, 2022
Bought on aliexpress Post Views: 51
RGB music sound led barMay 31, 2022
From aliexpress This is a cool light bar that reacts to music and sound unfortunately it does not have a battery inside in this version Post Views: 12
Yamaha Clavinova CLP-840 PianoMarch 6, 2021
This is a super piano from Yamaha. The Clavinova clp-840 has a great sound and feeling. Find the service manual here of the CLP-120 as I could not find the CLP-840 one Post Views: 807