BEST PERFORMANCE and PERFECT COMPATIBILITY: Fully compatible with the original charger and tool.It's easy to install . TRUST WORTHY RELIABILITY: no memory effect, low self-discharge rate (1% per month). Patented battery balancing technology, built-in over-protection circuit, provide safe and reliable use. GREAT SAFETY: Quality battery cells with CE and UL approval. Advanced battery technology provides improved energy density. Strong warranty: We guarantee to provide a safe and full capacity replacement battery. We also provide you with a 100% risk-free satisfaction guarantee. 30-day refund and 12-month warranty.