[PeteK]

Your link to the "Heated Vest" did not open for me, so I can't tell what you have. Need more info on the vest and battery.

That's probably not a "charger." it is a 12 volt cigarette lighter "adaptor." What kind of output does it have? A USB socket? Something else?

 

[PeteK]

That's not a motorcycle vest. It may reduce the chill for someone wearing it walking around town, but that's about all it's good for. 5v x 3A = 15 watts, which ain't much. The 12v adaptor to a USB has a very limited output, maybe 20 watts, probably less. That's adequate for charging a phone or running a GPS unit, not anything that draws more current. A heated garment for a motorcycle use is more like 70-100+ watts, so it cannot be powered a USB port. Instead, those plug into a 12volt connection, either directly into the cigarette lighter, or an SAE 12V plug. Look online at Cycle Gear for examples.

 

[PeteK]

In theory it should work. Your plug adapter has a max output of 36 watts, the battery pack maxes out at 22.5. The wildcard is not knowing what the vest input requirements are. If it requires 9v, you're adapter may be a little shy - it provides a max of 2 amps, the battery pack provides 2.22 amps. Is there a tag anywhere on the vest that lists technical details?

Well, I'll differ. The vest is only rated for 15watts. That's not enough to make a difference in your perceived temperature on a motorcycle. The "36W" adaptor is for BOTH USB ports, not one. It's roughly half that for one USB port, and as is usual with Chinese crap, that's probably optimistic.

Faruq: You can spend a lot of time and effort, and eventually money, screwing round with the vest you have, and you will not be satisfied. The bottom line for you is that if you want a heated vest, buy one intended for use on a motorcycle (or snowmobile) that uses 12 volts, and plugs directly into the cigarette lighter (not through a USB adaptor that only puts out 5 volts), or connects to an SAE plug wired to the bike's 12V electrical system. I speak from experience.

If you're limited on cash right now, the weather will be warming up shortly, so save your pennies until the fall and then buy the real thing. This is a case where "you get what you pay for."