There is back by the name of ‘Ham Radio Illustrated’, read that until you can get the recipe for batteries.
Honestly, it sounds like hard work, but all you need to make a ton of efficient batteries is a ton of scrap metal (which can be obtained from display cases/lockers) empty aluminium cans (drink some cola n’ shit) and vinegar (I see gallon jugs of vinegar quite often in bathrooms/kitchens of normal houses and most grocery stores.) A gallon jug of vinegar has about 20 of the 3 charges needed, grab one of those, tin cans, and scrap metal and you’re set for batteries galore!
Although dismantling some things are more quick & easy, this is a long term solution. And, if you’re desperate, you can use lemons for batteries because F*CK YEA LOGIC MATE.