Talk:1872: Backup Batteries
This actually sounds like the classic provisioning situation. How many spares do you require, and when do you require additional spares. One of the things that he doesn't mention is whether he carries a USB cord for his phone and USB power supplies for auto and wall outlet use. ( For iPhones, you need one cord for charging the phone and a different cord for charging the power pack.) I have three power packs in my bag normally. When one of the power packs is low on power, I plug it into an electrical outlet while using the phone. I also plug the phone into an electrical outlet when available to prevent the battery from running down. If at home or a hotel room, I can also have one or two power packs charging while I travel with the phone and the third power pack. I also charge the phone overnight. Having multiple power packs doesn't do any good without a means of maintaining them in a charged state. I typically start the day carrying a charged phone and three charged power packs, which is enough to let me use the phone all day. At night, I plug all of the devices into electric power. If I really wanted 24 hour usage or a lot of gaming (games use up the batter faster), I could use six power packs but only carry three with me at a time. The other three would be charging at a base location.
Having too many redundant backup devices can actually reduce the up time of the system. This was seen at the Superbowl in New Orleans. http://www.espn.com/nfl/story/_/id/9082144/relay-device-malfunction-caused-super-bowl-xlvii-power-outage-according-expert It is also very dangerous to assume that your backups are adequate and that you don't have to watch the log files. If somebody had been reading the logs, they would have seen the message that essentially said: "I have reported two power surges and you haven't told me what to do. Although these are not individually dangerous, one more power surge before somebody talks to me and I shut down the entire stadium."
An optimist states that the water glass is half full, while a pessimist states that the water glass is half empty. What an engineer really does is find out where the water faucet is so that he can refill the glass as needed. (The original joke says that the engineer states that the glass is twice as large as needed. This is ridiculous unless he knows how much water is needed and how much is available at the faucet. The size of this glass is irrelevant unless it is too large to be handled easily or too small to transport water at the required rate.)
BradleyRoss (talk) 17:21, 4 August 2017 (UTC)
Assuming he charges the batteries in series (i.e. the second backup charges the first backup which charges the phone, etc.) I wonder how many batteries he'd be able to go through, before the charging/discharging inefficiency (heat generation etc.) meant none of the original power would get to the phone? Also I can relate to this comic, when traveling I may bring 2-3 batteries, even though in practice I rarely need more than one 😝😂. 18:58, 4 August 2017 (UTC)
