"There are a lot of weird scam tools out there. Soaring power bills have made the " power saver" scam devices popular, but the other day I came across another odd one called a "USB Phone Battery Repair Multipurpose Battery Restorer Efficient Repair" dongle. Also: Want to cut your electric bill? Skip these scam 'power-saving' devices, and buy this instead It claims to do a lot, but rest assured, all it does is take your money."
"But alas, apart from being a useless scam, it's quite innocent. I tore mine apart, and inside is very little. Inside the plastic box is a circuit board, on which are two blue LEDs and a tiny resistor to prevent the LEDs from blowing up. That's it. The purpose of the LEDs is to illuminate a fake "display" with Chinese writing that says "under repair.""
Many cheap USB battery "repair" dongles make broad claims of restoring phone batteries but function only as deceptive accessories. A physical inspection reveals a small circuit board with two blue LEDs and a tiny resistor that merely lights a fake display reading "under repair." Usage instructions advise long, repeated sessions over several weeks, effectively preventing timely returns. The device provides no actual battery restoration or useful electrical function. The dongle is a low-cost scam marketed with misleading claims, while legitimate battery care requires proper charging habits and genuine diagnostics or replacement when capacity degrades.
Read at ZDNET
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