Check the listing for details. 2x Rechargeable Battery REPLACEMENT For Coast ZX850 Battery with Micro-USB. Condition: New. Listed at 21.99 USD. Built-In Micro-USB Charging PortCan Be Inserted into a ChargerSmart Charging CircuitryPressure Release Valve ProtectionWarranty- 30 Days Money back guarantee and 18 Months WarrantyKastar 3.7V 2600mAh USB Rechargeable Lithium Battery, Steady Voltage for High Current Applications1000 cycles time & Low self discharge - Long battery Life Kastar 3.7V Li-ion battery can recharge up to 1000 cycles, equal to 1000+ disposable batteries, more powerful and lasting long The advantage of lithium ion batteries is low self-discharge and no typical memory effect, don’t need to worry about reduction of the battery life after constantly charging and discharging.3.7V Lithium USB rechargeable battery - Steady Voltage These Li-ion batteries can provide approximately the same and steady voltage until the whole cell is depleted, make the devices working stable and lasting longer. Perfect for the devices that need high battery performance.Fast Charging & 2600mAh High Capacity Batteries Advanced iQuick charging technology, the 2600mAh high capacity battery will be full charged within five hours, and it can provide longer working time than alkaline and NiMh batteries for every chargeBuild-in LED Light Shows the Charging Process The LED indicator shows the red light when battery is recharging. The LED indicator shows the green light when battery was fully chargedSmart Charging Design - Easy to Charge Anytime and Anywhere Unique design with a micro-USB port in the side of the battery, come with a Micro USB cable. It can be directly recharged by plug in a USB port like laptops, power bank, wall adapter, etc. Easy and convenient to charge at anywhere and anytime.NOTICE: Kastar BATTERY IS LARGER THAN NORMAL 3.7V BATTERY, PLEASE CONFIRM BATTERY SIZE BEFORE PURCHASE!!Warnings:Do not overcharge or overdischargeRecharge drained batteries immediatelyDo not short circuitDo not dispose of in fireDo not expose to extreme heat or waterPlease be familiar with handling lithium-ion batteries before purchaseUsage of batteries is at your own risk!