How much time will it take to completely charge the battery? 1 to 1.five 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 https://www.thesafetycentre.co.uk/blog/testifire-xtr2-fire-alarm-testing-equipment-range-faqs/