Capacity: 1850mAh Battery Type: Li-ion Voltage: 3.7V Model numbers fit to: TP-Link TL-MR11U, Portable Mini 150Mbps 3G Mobile Wireless Router, TL-MR3040 Compatible battery part numbers: TBL-68A2000 RoHS approved for toxic free. CE and ISO9001 Certified for Quality Assurance. Search Tip: Press Ctrl and F keys to prompt a search dialogue box, then type in your device's model number and click 'Find Next'.