How much time does it take to completely charge the battery? one to 1.5 hours How much time does it take to charge the battery to 50%? thirty to 40 minutes When charging the battery for 30 minutes, to what % is it charged? ~fifty% How many smoke only tests https://www.thesafetycentre.co.uk/blog/testifire-xtr2-fire-alarm-testing-equipment-range-faqs/