Hey Phil, if you read the comments there are plenty of suggestions for alternate batteries. Really any 18650 format battery will fit the needs of this speaker. I'd look for a name brand with a decent capacity. Solder tabs are preferred. I soldered the old battery protection board directly to a battery but this is not reccomended. I'd also reccomend having some foam on hand so your battery doesn't have room to shake around. The bose battery had foam wrapping it. Good luck!
