DD we are reading the same page, yours allows use of any brand battery and requires a volt for use of commercial available items for aircraft use, mine is a brand specific as I assume a quality control between Artex and Duracell for commercial available use.
So for the OP yes it is at times possible to use items from the local hardware shop, but they need to be approved for use by (anyone willing to get them approved) a paperwork procedure.
We once got approval to use marine engine control cables for some of our aircraft. They needed to be Brand Specific and floor tested to 1.5x expected force, before fitment.
Other aircraft now have several items including lights and gauges that are brand specific commercially available. These are smaller types but becoming far more common.