Hands down the best battery available for the iPhone 5s, we have sold over 250000 Replacebase batteries since we introduced them to the market and they have become the number 1 battery for repair shops and end users due to the great performance that rivals even the original Apple battery, Our Replacebase iPhone 5s battery is made by leading manufacturers using the latest techniques, Japanese cells and second to none testing processes They are safety tested to the highest standards and are CE safety certified (unlike many on the market) - they are also RoHS compliant and we are able to provide an MSDS safety sheet if required. Includes bonding adhesive Capacity: 1560mAh Cycle Life (rated to last): 500-800 Charge Cycles Current Cycle Count: ZERO Charge Voltage: 3.8v Weight: 28g Rated Life: 2-3 Years Cathode Material: Pure Cobalt Anode Materials: Graphite Cell Origin: Japan Cell Type: Li-ion Working Temperature: -20 / 50ºC Optimal Temperature: 20-30ºC Warranty:This battery is covered under our 12 Month limited warranty, terms apply