Patented battery balance technology, built-in over-protection circuit to provide safe and reliable use technology to protect your use. BEST PERFORMANCE and PERFECT COMPATIBILITY: Fully compatible with the original charger and tool. TRUST WORTHY RELIABILITY:no memory effect, low self-discharge rate (1% per month). 2500mAh Li-ion Battery Ozito Genuine 18v Cordless Power X-Change Li-ion Battery 4ah And Eco Einhell Akku Fit battery: EIN PXBAT52 PX-BAT52 Power X-Change Battery 18 Volt GREAT SAFETY: Quality battery cells with CE and UL approval. We also provide you with a 100% risk-free satisfaction guarantee. Einhell Power X-Change 18V, 4.0Ah Lithium-Ion Battery Starter Kit Voltage limit: 18V Battery capacity: 1500mAh 2000mAh 2500mAh 3000mAh 4000mAh 5000mAh 6000mAh Battery type: Li-ion Original battery model: PXBAT52 PX-BAT52 Power X-Change Battery Compatible with: PXBP-600 PXBP-300 PXBAT52 PX-BAT52 Status: Brand New Packing specification: bulk package (bubble envelope bag) Made with high quality battery cells, environmentally friendly, effective, stable and... Strong warranty: We guarantee to provide a safe and full capacity replacement battery. 30-day refund and 12-month warranty.