<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>Retric</author><text>Battery production is measured in Wh per year because you care about capacity to store energy.  40GWh = 40,000,000 kWh &amp;#x2F; (80kWh per car) = 500,000 cars.&lt;p&gt;240 GWh = 3 million 80kWh cars.</text><parent_chain><item><author>jupp0r</author><text>&amp;gt; PowerCo will use the prismatic unified cell architecture in its batteries which allows for use of different cell chemistries. The cells will be manufactured from 2025 with the factory planned capacity to be 40 GWh which is enough to supply 500,000 electric vehicles. By 2030 PowerCo plans to have all six European factories up and running with a combined capacity of 240 GWh. The unified prismatic cell harnesses synergy effects and can offer manufacturing savings of up to 50% when compared to current batteries.&lt;p&gt;Why can&amp;#x27;t journalists use units correctly? I&amp;#x27;m assuming the above is per year (but who knows?).&lt;p&gt;Side remark: it&amp;#x27;s actually kind of cool that you can literally specify the battery output of these factories in Watts.</text></item></parent_chain></comment><story><title>Volkswagen enters battery business with $20B investment</title><url>https://www.arenaev.com/vw_creates_new_company_and_enters_global_battery_business-news-461.php</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>csours</author><text>Watt is power, Watt hour is energy. 1 Watt hour is 3600 joules, which looks suspiciously like 1 joule = 1 Watt second.&lt;p&gt;Most batteries now advertise energy capacity in kWh or thousand Watt hour(s). 1 kWh would be 3,600,000 joules or 3.6 megajoules, which does honestly sound more badass.&lt;p&gt;In the past batteries would advertise capacity in Amp hours, but you have to know the voltage of the battery to convert Amp hours to energy.</text><parent_chain><item><author>jupp0r</author><text>&amp;gt; PowerCo will use the prismatic unified cell architecture in its batteries which allows for use of different cell chemistries. The cells will be manufactured from 2025 with the factory planned capacity to be 40 GWh which is enough to supply 500,000 electric vehicles. By 2030 PowerCo plans to have all six European factories up and running with a combined capacity of 240 GWh. The unified prismatic cell harnesses synergy effects and can offer manufacturing savings of up to 50% when compared to current batteries.&lt;p&gt;Why can&amp;#x27;t journalists use units correctly? I&amp;#x27;m assuming the above is per year (but who knows?).&lt;p&gt;Side remark: it&amp;#x27;s actually kind of cool that you can literally specify the battery output of these factories in Watts.</text></item></parent_chain></comment><story><title>Volkswagen enters battery business with $20B investment</title><url>https://www.arenaev.com/vw_creates_new_company_and_enters_global_battery_business-news-461.php</url></story>