Xtar continues to prove they are the leader when it comes to battery chargers. The MC2 is the replacement/upgrade to the MC1. It now has 2 bays, while still maintaining its’ small and compact (easily portable) size. Both of the ports on the MC2 are independent, meaning whether you set it to the .25 Amp or .50 Amp, each bay will be receiving that amount of current, without it being cut in half when two batteries are being charged. It is compatible with a USB cable and any USB port adapter. The MC2 is capable of charging two 14500 / 14650 / 16340 / 17500 / 17670 / 18350 / 18500 / 18650 / 18700 / 26650 3.6V/3.7V Li-ion batteries. It features three-stage charging and 0 volt battery activation, meaning it can revive over-discharged protected batteries. Some of the safety features of the MC2 are the low voltage and over heat protection, as well as reverse-polarity and short circuit protection. The LED indicators do real-time status indication, so you will know if your battery is charging, charged, or if it has been inserted incorrectly. The MC2 adopts high efficiency DC-DC circuit, which lowers the voltage and reduces energy loss. This charger is compact and portable. With any of the Xtar products, there is no worries about over-charging batteries, or the charger not shutting off when the battery is charged. Another brilliant battery charger option from Xtar.