For the neckband, they have an inbuilt battery of 95-130 mAh. Some of them last for about 8 to 16 hours, depending upon the volume & other factors. In short, neckbands at this price (Rs. 1500) can easily last for a day or two. On the other hand, earbuds have a power case. The fully charged earbuds last for around 3-4 hours. The charging case provides an extra 3-4 charging cycles for the earbuds.