A big reduction versus the Amazon batteries.īut 3200/34 equals 94. That maths gives us 1000/2.5x8, or £32 per KWh.
#Battery operated lights tv#
Well for one thing, you need Zinc batteries to run a light, the very cheapest Alkaline batteries will only run a TV remote or a clock as they aren't powerful enough for lights.īut the cheapest Zinc batteries at Poundland right now are 12 for £1. Okay, so what if you're buying the cheapest cheap Poundland batteries? 235!Īnd if you're buying the more expensive 12 packs? The cost is back to 600 times more. The maths works out at 8,000/34 or.drum roll please. Now current electricity prices are no longer 15p per unit (weep), they are 34p per unit. You save a LOT less money buying smaller packs, for example a 12 pack is 51p per battery, which would cost you a whopping £204 per kwh. That works out at slightly cheaper than three years ago - as long as you buy 100 at a time. There are still 2.5 watts per cell, so the cost of these is 1000/2.5x20 = 8,000 pence, or more simply, £80 per KWh. That works out at a cost of 20p per battery. Now, these numbers are from three years ago, so YorkshireLive ran these numbers again but updated to reflect 2022 prices for both batteries and electricity - because as Liz Truss will tell you, things change fast.Ĭurrently, the cheapest way to buy batteries is to get a pack of 100 Amazon basics AA batteries for £19.88. "So the answer to the question is no, batteries are not cheaper, at least not compared with the domestic electricity supply." So even these relatively low cost batteries bought in bulk are 9000/15 = 600 times more expensive. "Now I don’t know what you pay your electricity supplier per kWh, but 15p is typical for current UK electricity pricing. There are of course 1000Wh per kWh, so that works out to be 1000/2.5x22.5=£90 per kWh. That’s 2.5Wh per cell, at a cost of 22.5p per cell. At this rate we should get 2Ah per cell, at an average voltage of around 1.25V.
"We can always use cells in parallel if we need a higher current. The capacity of Alkaline batteries varies depending on how rapidly you discharge them, but let’s assume we want the best possible bang for buck and so we keep the discharge rate per cell down to, say, 100mA. "After a very quick look on Amazon the cheapest AA Alkaline batteries I’ve noticed are Amazon’s own, selling at 40 batteries for £9.
Posting on Quora, IT computer expert Paul Grimshaw said: "Are batteries cheaper than electricity? Well let’s work it out. They just sell some very well rated cheap lights, and buyers do love them, so if you aren't buying to save cash, they are surely a lovely addition to any room. That isn't Primark or M&S' fault of course, neither firm ever claimed they are cheaper to run than your mains power. Once the batteries need replacing, as one expert has pointed out on knowledge sharing site Quora, they will cost as much as 600 times more to run - even with cheap Poundland batteries. Cheap Percy Pig lights available at M&S with batteries included (Image: M&S)
0 kommentar(er)
