How many hours take fully charge

It depends on how big capacity battery you are charging. The output charge current is 800mAh for each cell of the lipo battery.

Can I use this for Airsoft?

If your li-po battery is with a white balance XH plug. Then it will be working with it.

Does the charger auto pause charging when battery is full?

I don’t know about auto pause but it does stop charging once the batteries full

Is it normal for the lights to flash red and green really fast with no battery plugged in?

You can try to unplug the charger and leave few minutes and retry again. If you keep doing like that pls contact our team via this link. https://www.amazon.com/gp/help/contact-seller/contact-seller.html?sellerID=A3LNU2QH79J34B&marketplaceID=ATVPDKIKX0DER&ref_=v_sp_contact_seller

ASIN	B099K8XFG6
Best Sellers Rank	513,602 in Toys & Games ( See Top 100 in Toys & Games ) 1,033 in Remote & App-Controlled Battery Chargers
Guaranteed software updates until	unknown
Item model number	B3V2
Manufacturer	SUPULSE
Product Dimensions	9.09 x 5.64 x 3.45 cm; 140.61 g

SUPULSE RC Balance Lipo Battery Charger 2S-3S, 11.1V, 10W, Compact, XHR Plug Compatible

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