So you probably shouldn?t put spare AA?s in there. They are so comfortable ~ I bought them to replace the Okabashi slides I had for a couple of years. Has worked perfectly for what I needed it for. Fits perfectly but! The company went out of their way to contact me and send new charging wires at no cost. 3: The sound quality is fantastic. i ordered this mouse recently thinking it was a good deal! it needs to and adjusts the fan speed accordingly and efficiently! When I tried these slippers on, they immediately felt acceptable, and after two days of wearing them, they felt perfectly sized. I have owned several JBL products over many years and have never had an issue, and I definitely do not anticipate having one with the Charge 3 ***THIS NEXT PART IS VERY IMPORTANT*** There are a LOT of 1 star reviews of this speaker, but if you read through them, you will see that the majority (probably 90%) of the negative reviews are due to the fact they the purchaser received a counterfeit unit.