Many "cheaper" vlog cameras or portable media players use 18650 lithium-ion batteries . These are rechargeable, cylindrical batteries (18mm x 65mm) that provide long-lasting power for mobile recording and playback.
Common hardware in this category includes 4-inch to 6-inch TFT or IPS touchscreens with resolutions such as 800x480. 18660mp4
While "18660mp4" is not a standard industry term or common video format, it most likely refers to a or a specific product model (like the Mystery MNS-640MP/570MP series) found in wholesale electronics databases . Many "cheaper" vlog cameras or portable media players