Sounds like a bad battery... L-I batteries will sometimes swell when they go bad and force the case to open up.The battery itself popped open. I sent mine to Uniden for analysis. The battery was not being charged or recently had been charged. It was sitting on the small cover at room temperature.
Yes, I bought one from Scannermaster.com and have been testing it. I'm getting a good 4 hours of constant use before it beeps. I have my low voltage set for 3500.I would love to purchase a couple of these small batteries but I remember my original small battery quit charging within 6 months after purchasing one of the first SDS100 scanners. I wonder if this is old leftover stock or a completely new manufactured battery. Does anyone know or has anyone purchased and used the small battery for any period of time?