Product details of Beston 1pcs 800mAh 9V Rechargeable Lithium Battery Beston High-quality 6F22 800mAh 9V rechargeable Lithium battery for cell phone Battery: 6F22 9V 600mAh lithium-ion rechargeable battery Improved low self-discharge makes it still maintain 75% of capacity after 3 years of non-use Recommended for smoke alarms, professional audio and...