Left a battery out in the rain : r/ryobi
Storm popped up, so I put away everything. Except the camping chair that ended up holding enough water to submerge the whole battery that had half a charge. About 3 hours later I found my mistake. I instantly put 3 gallons of rice in a five gallon bucket and left the battery in the rice for a week. Battery Still works even after about 12 recharges.