黎巴嫩采购需求：离网太阳能系统、太阳能家庭照明系统、太阳能电池板、太阳能冰箱、太阳能泵、12V电池

I hope this message finds you well. I'm reaching out regarding a battery I've been using for approximately 2.5 years. It seems to have lost a significant amount of its capacity and no longer performs at its optimal level. Could you please provide some insights on potential solutions or guidance on how to address this issue? I'm particularly interested in knowing if there are any maintenance tips, repair options, or replacement possibilities available. Your assistance would be greatly appreciated as I'm looking to restore the battery's functionality. Thank you!