GSM Frequency Bands : 850/900/1800/1900MHz. Tip: Before use, ensure your area has strong 2G GSM coverage and insert an active Nano SIM card (not included). The device does not support 3G/4G/LTE networks — only 2G GSM.
Nominal Capacity: 500mAhFeature: Rechargeable BatteryType: Li-polymerModel Number: 502540Size: 5x25x40mmVolt: 3.7VCharging current: standard charging, fast charging: 1 .OC: 0.5CStandard charging method: 0.5C CC (constant current) charge to 4.25V, then CV (constant voltage 4.2V) chargetill charge current is less than or equal to 0.05CThe maximum charge current: 1CMaximum discharge current: 1CDischarge cut-off voltage: 2.75VThe discharge temperature: -20 degrees C-+60 degrees C Charging time: 5-6hrs (standard); 2hrs (fast)Protection function: over charge, over discharge, over current, short circuit protection, over temperature protectionIt can be recharged repeatedlyBuilt-in protection circuit PCM for prevent over charging or over discharging.NO CONNECTOR. NOT FOR DRONES HELICOPTERS