Wrong again, in a commercial dry cell the manganese oxide is used as a medium, the active ingredient is the potash (potassium hydroxide). This is an alternative to the lead-acid type of “battery” used in older cars…
So-called “alkaline batteries” are a different chemistry altogether and even they are NOT meant to be recharged…
Quoting Wiki: “ Some alkaline batteries are designed to be recharged a few times, and are described as rechargeable alkaline batteries. Attempts to recharge standard alkaline batteries may cause rupture, or the leaking of hazardous liquids which will corrode the equipment. However, it is reported that standard alkaline batteries can often be recharged a few times (typically not more than ten), albeit with reduced capacity after each charge; chargers are available commercially. Results are not consistent; consumer organisation[which?] reported that it tested two such chargers with Energizer alkaline batteries, finding that battery capacity dropped on average to 10% of its original value, with huge variations, after two cycles (without stating how depleted they were before recharging).[12]”
and:
“ Alkaline batteries are prone to leaking potassium hydroxide, a caustic agent that can cause respiratory, eye and skin irritation.[note 1] Risk of this can be reduced by not attempting to recharge disposable alkaline cells, not mixing different battery types in the same device, replacing all of the batteries at the same time, storing in a dry place and at room temperature, and removing batteries for storage of devices.”
Modern rechargeable cells or batteries are based on lithium, which has made this element the basis of intense international scrutiny.