Do not buy bison gun lock - Bison L2 Biometric Fingerprint Trigger Lock

Yes, I charged it up and locked my shotgun and left it for a few months. When I went back to unlock it, the battery was dead. I use the key to manually unlock it, and then I plugged it in to recharge it. It would not recharge. I contacted bison, the manufacturer, and they told me there was nothing they could do for me. Apparently they do not stand behind their product or care about their customers.