Built for commercial use the ego power bax1501 28.0ah battery, harness and adaptor set lets you work all day long with with minimal strain on the body. The sturdy backpack is resistant to heavy rain and fitted with a durable casing which will protect against knocks.ego products can match 80% of petrol products on the market but without the noise, fumes and running costs. The lithium ion batteries have a innovative arc design which distributes heat evenly to avoid over heating. The keep cool™ technology keeps the quality cells in their best condition and recharging fully without fade, time after time. cordless power is quiet and perfect for contractors working in areas where noise would be an issue, such as schools, hospitals and parks. backpack features  led power level gauge to indicate remaining power levelsair vents for cooling12v and usb charging optionsdetachable weather resistant harnesscomfortable padded strapsretractable carrying handlein the kit ego backpack battery bax1500 , harness and adaptor egbh1001 specifications battery capacity 1568wh, 56vcharging time standard 420 mins, rapid 210 minscycle life up to 1200 cyclesled fuel gaugehigh current capacity cableconnection adapter plug inharness weatherproof protection ip56battery weight without harness 9kgwarranty 3 year domestic, 1 year commercial