The R-30 4Watt Tungsten Halogen rechargeable torch, is light weight. At just over 300g, it is only one third of the weight of its heaviest competitor and three quarters of the lightest. In a power and light output comparison with the competition, this Wolf model matches the best and notably surpasses the worst product. The bulb can be changed in seconds as a spare is stored in the head. The Lithium-ion battery can be moved and replaced in around a minute each
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Invinity to build 20MWh flow battery in UK
A surprising comment for someone who (I think you´ve said in the past) worked in the industry. National Grid have a variety of reserve service schemes...