The battery must meet international medical safety standards such as IEC 60601-1 (medical electrical equipment safety) and UN38.3 (safe transport of lithium batteries). Key specs include capacity (mAh) for long surgery duration, voltage compatibility with specific drill brands (e.g., Stryker, ConMed, or Hall), and cycle life, which should ideally exceed 500-800 sterilization cycles. Always request CE or FDA registration documents to ensure the product is legal for clinical use in your target market.