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