Fenix ARE-C2 four bays Li-ion/ Ni-MH advanced universal smart battery charger with Two Edisonbright AA-&gt;D battery spacer shells Designed for a broad spectrum of Li-ion and Ni-MH rechargeable cell sizes Automatically select charging modes based on the battery loaded Accelerated charging LCD display for battery voltage and charging status Compatible with Fenix 18650 types (ARB-L2/ARB-L2S) and many other brands and types of batteries including rechargeable Ni-MH/ Li-ion types AA/AAA/18650/RCR123/16340/14500/26650 and many more 2X EdisonBright AA to D battery converter spacers included. These allow use of rechargeable AA batteries in D battery equipment.