That "240W" Power Bank Is Probably Just a 100W Bank With a Nice Cable
here is something most Indian buyers do not know when shopping for a laptop power bank: the 240W number on the box almost always refers to the cable bundled in the box, not the power bank's actual output. a 240W cable can only carry what the power bank sends down it. if the power bank is PD 3.0 rated, it caps at 100W. that is it. USB PD 3.0 tops out at 100W. USB PD 3.1 EPR is the newer standard that goes up to 240W and is specifically for gaming laptops and workstations that draw above 100W under real load. most listings borrow the 240W label because of the cable while the power bank inside never goes above 100W. browse GrunX store India for power banks with PD version clearly stated on every listing.
matching the right wattage to your laptop takes one minute. look at the label on your original charger brick, the wattage is printed on it. MacBook Air and thin ultrabooks draw 30 to 65W. the 14-inch MacBook Pro and standard productivity laptops draw 65 to 100W. gaming laptops and 16-inch MacBook Pro can draw 140W or more under load. a 100W power bank covers everything in the first two groups. only the third group genuinely needs a PD 3.1 EPR power bank above 100W. buying higher wattage than your laptop actually draws adds cost and weight for no real benefit.
before buying any laptop power bank, check two things. the power bank itself must explicitly state PD 3.0 or PD 3.1 EPR, not just the cable. if a listing only says 240W cable included without stating the power bank's PD version, assume it is capped at 100W. also confirm the cable itself is rated to carry the full wattage since an underrated cable can bottleneck even a genuinely EPR-capable power bank. the full guide covering PD 3.0 vs PD 3.1, how to find your laptop's real wattage, and the 240W cable trap is at 240W power bank laptop charging guide India on the GrunX blog.