Very fast battery drain: Canon 200D SL2 with Sigma 150-600 contemporary lens

[rahat]

My 06 year old Canon 200D SL2 still works exceptionally well in terms of number of shots with kit lens of Canon 55-250mm but when paired with a Sigma 150-600mm contemporary lens drains the battery very fast.

The lens motor seems to be running even when the power button is kept OFF unless I remove the battery from camera. The battery will drain off within 2-3h even without switching it ON when the lens is mounted.

Is it the small size of the battery or the incompatibility of the 200D with lens or may be something wrong with this particular piece of lens?

Any leads would be genuinely appreciated.

Thanks in anticipation everyone.

[p4pictures]

Lenses should not drain batteries when the camera is switched off. You mentioned that your other Canon 55-250mm lens works fine with no battery drain, I think it is a lens issue. 

In use with the camera switched on larger lenses with bigger AF motors and more large glass elements to move will drain a battery faster than a lightweight small lens. 

[rahat]

Hello All

I'm here to give you all an update on this. So I gave the lense to a Sigma service centre person and he says the lense was not assembled properly after the last fungus cleaning/ service job.

He's assembled it properly now and there's no noise anymore. Also, the pictures are sharper than before with battery lasting almost throughout the day.

I think the problem is resolved but the guy says the parts have gotten worn out due to wrong assembly and the lense might only have a life left of about 2-3years.

Thank you everyone for your support through this.

Cheers