It is important to note that Lead Acid batteries may stop working if they are completely discharged. Therefore, it is recommended that you do not let your battery drain completely and recharge it after each use. If you suspect that the battery of your unit is dead, you can get in touch with the customer service team of Gemini to arrange for a replacement.
You can purchase a replacement battery at the following link: GSW-T1500PK Replacement Battery: 12V 9AH (geminisound.com)
Product: GSW-T1500PK