Can minolta Maxxum 400si 35mm SLR Camera support rechargeable batteries?

Any strange shaped specific battery has multiple commercial batteries inside that are spot welded to each other. The interior can be replaced with new rechargeable commercial batteries if necessary.

link to your manual, it tells us that we have a winding motor problem, I would do as you have done, so I would ensure that batterys are in great shape, the only other thing I could suggest is to try to turn the winding motor by hand in case it is just locked up. Failing that I presume the motor has died and needs replacement.

It uses a 2CR5 battery, which should be available at most electronics or office-supply stores. An online source is at http://www.batteriesplus.com/product/31018-RAYRL2CR5--1-Lithium-Battery/563-0/4739-Film-Camera-Battery/56279-Minolta/Maxxum-400si.aspx

It has a Minolta A-mount lens. Any of the newer Minolta (and some Sony) lenses may be used. The older Minolta lenses for the SRT-series cannot be used.

You may download a copy of the manual from here.

You need one 2CR5 lithium cell for your camera. They're still available, see here for details. Note that other suppliers stock them as well, I only link to the supplier provided as they're where I buy mine and the page shows you alternative model numbers that the battery is sometimes known by.

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If its on the top panel, its telling you that there is a film cartridge in the camera, already rewound and ready to come out.

it may not be the camera's. Some retail stores do not rotate their stock....in other words you may be purchasing an old battery. Check the dates on the package. My suggestion to you is to buy your batteries at a camera shop.

My daughter took the camera to her photography teacher he was able to load the film by wrapping more film around the roller. It's not as easy to load as my Canon. I thought we had put plenty of film around it already. Oh well, it's working anyway.

Here you go:
http://www.nodevice.com/user_manual/konica_minolta/film_cameras/dynax_500si_maxxum_400si_rz_430si_450si_alpha_303si.html

Sorry, the mounts of Minolta manual focus lenses are different than their auto focus series. Sigma, Tokina and Tamron all make compatible zoom lenses to fit the Maxxum series cameras