Inside a USB rechargeable bicycle warning light.

This item came up in a search on ebay for LIR2032 which is a rechargeable lithium cell. I bought it to take a look inside to see what sort of charging circuitry is used for the cell.
I'm afraid it's not very exciting. At first glance it appears that the control of the LEDs and the cell voltage management is all integrated onto a single chip that is a resin blob COB (Chip On Board). The light is clearly not waterproof and is unlikely to handle adverse weather with dignity. the charging port is a common small power-jack connector which was a bit dodgy and is likely to inject any trapped rainwater directly into the case when used.
But hey. It's cheap and kinda works, so if you're prone to losing your bicycle lights then this might be a viable option. It also contains a removable LIR2032 cell which is handy.