I have some 18V alkaline battery packs that read 16V on a multimeter. First question - are these still worth keeping? If so, I was wondering if there was a useful/fun use for them. LED light strip maybe? Anything that would make an interesting home/shed project for a novice, don't mind spending a little money to buy tools and bits. Each pack has 2 x 2-pin connectors to connect in parallel. Battery pack details (as read from the label) 18V / 30Ah / 540Wh. Also have smaller packs 18V / 10Ah / 180Wh. The packs were originally used for running an environmental recording device in the field.