A compact two-slot charger for 3.6V Li-ion batteries, designed for those who work with equipment powered by detachable batteries — from wireless tattoo machines to other studio devices. The electronic display shows the charging status, and the built-in protection functions (short circuit, reverse polarity, overcharging) reduce the typical risks of charging Li-ion cells. It is a practical solution if you want to always have a second set of batteries ready between sessions.
Which batteries can I charge with this charger?▾
It is compatible with Li-ion 3.6V batteries in the following formats: 10440, 14500, 14650, RCR16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 26500 and 26650. Do not use it with other battery types or chemistries — always check the marking on your cell before charging.
Is it suitable for my wireless tattoo machine's batteries?▾
It depends on the machine. Many wireless machines have a built-in battery and charge directly via their own cable — those do not need this charger. However, if your equipment uses detachable cylindrical Li-ion 3.6V cells (for example 18650 format or another from the compatibility list), this charger is a suitable choice. Check the exact format of your cell before ordering.
Can I charge two batteries at the same time?▾
Yes, the charger has two slots and supports charging two batteries simultaneously. For details on combining different formats in the two slots, consult the user manual included in the package.
What do I get in the package and how is it powered?▾
The package contains the Efest Slim K2 charger, a USB cable, and the user manual. Power is supplied via the included USB cable; a wall adapter is not mentioned in the package contents, so you need your own USB source.
What do the protection functions do and why do they matter?▾
The charger has protection against short circuit, reverse polarity, and overcharging. Essentially, if you insert a battery backwards or an electrical issue occurs, the charger prevents dangerous situations, and at the end of charging it stops the process to avoid overstressing the cell. However, these protections do not replace proper handling: damaged batteries remain a risk regardless of the charger.
How do I maintain and sanitize the charger in the studio?▾
Wipe it periodically with a dry or very slightly damp cloth, only when it is disconnected from power — never with excessive liquids and never by immersion. Do not spray disinfectant directly on it. Most importantly: keep it in the clean area of the studio and do not handle it with the gloves used during the procedure, to avoid contaminating surfaces that you then touch with clean hands.
