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The light actually hits over the claimed output with a MOLICEL P45B 21700! The tint isn't great but the UI is a treat. Here's my in-depth FT02S V2 youtube review: https://www.youtube.com/watch?v=MAkZk_QKxxo&t
On arrival the voltage of the battery was 3.7V, the voltage optimal for long-time storage. A BIG plus for Astrolux. __This is a BEAUTIFUL fleshlight, on the same level of beauty as my Astrolux FT03. Ergonomic, has a good grip. Its brightness is stunning. On Turbo step-down starts after 98 seconds, on max. ramp its a few seconds longer - rather short, this is the only shortcoming of this otherwise flawless piece. The body is very hot when step-down starts - no wonder at this compact size. Min. ramp could be a bit dimmer but its still OK. __Another complaint is the lanyard. The loop at the end is very thin, sooner rather than later it will tear. __The recharging current is 2A and starts to decrease when the battery voltage gets close to 4.2V. The cut-off current is 120mA as measured at the Type-C port. At the end the voltage of the battery is 4.19V. The light can charge my Xiaomi smartphone with no problem. __All in all, this product is highly recommended.