iBattz iPhone 6 Invictus 3,200Mah Battery Charger Case - Space Gray Easy Battery Change Patent-pending design that allows for easy swapping of batteries Modular Design Eco-friendly with battery replacement instead of changing the entire battery bank. All other lithium ion battery case have limited charging lifespan of 300-500 cycles. Standard Battery Module Uses standard battery module, allowing for compatible replacement batteries, which are readily available. Each battery provides up to 120% extra power for your iPhone 611 Based on an iPhone 6 battery with at least 15% remaining battery life.