Yeah, that’s odd. The manual clearly states 4 x 1500mAh. You might want to shoot Nitecore an email and ask about it. They’re usually pretty good about responding in a timely fashion.
I have had mine for about a week. I have only used it on the default settings. I have charged Lithium Ion (protected and non protected) 18650, 14500, 10440, 18350, 26650, RCR123A, Eneloop and Eneloop Pro AA and AAA and Amazon Basics AA and AAA. All has worked great until tonight when slot 4 ceased to work with any type/size of cell. With a battery in slot 4, it would not be recognized and I could not use the C button to tab over to slot 4 and I could not adjust the charging rate for slot 4. I tried unplugging the SC4 and trying again but with no luck. I have just sent an email to info@nitecore.com and I will see what they have to say. This was purchased from Banggood