How long does it take to fully charge the battery? one to one.5 hours How much time will it take to charge the battery to 50%? 30 to forty minutes When charging the battery for 30 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/