My hypothesis is that the more a battery is advertised (brand name) the better it will work because more places want to promote them since they work so well. The more underrated batteries will work worse because not many stores promote them since they don't work as well. 

Now let's move on to the testing. I think that the the colder the environment the worse a battery will work. Also, I think that if a battery is cycled in hot and cold temperature a bunch of time that will make the battery work worse than when it first started.

1. Batteries work because of chemical reactions. Temperature can sometimes affect the materials that cause the reactions and can affect the way the reaction works
2. Some batteries last longer because the materials are different and sometimes better  also sometimes price matters. My project shows that the more expensive the battery the better, but that doesn’t mean it's the best value. 
3. Batteries that cost more will likely last longer because they were made with better materials. The better materials will help it last and my experiment shows that Energizer = $0.83/battery, Duracell = $0.63/battery, Voniko = $0.42/battery,  Great Value = $0.31/battery. As you can tell this goes most to least money it also goes first place to last place in longest lasting and charge.

• Battery tester
  • Discharge resistance
  • Location of the batteries in the tester
  • Type of tester
• Type of batteries (Alkaline) 

Test Procedure #1 

For my first test the battery tester was in my dining room and the temperature in the room was 20 ᐤC. I got one of each of my batteries and put them into the battery tester and set the batteries to discharge at 600 mA. Every 20 mins I would check on them and recorded the data so I could make a graph at the end.

Test Procedure #2 

For my second test the battery tester was outside and the temperature outside was 1 degree ᐤC. I put each of the different batteries into the battery tester and also set them all to discharge at 600 mA and this time I checked them every 15 mins.

Test Procedure #3

For my third test the battery tester was outside and the temperature outside was -10 degree ᐤC. I put all my batteries in to the tester and set them all to discharge at 600 mA. I set a timer for 10 mins to check and record the charge on the batteries.

Test Procedure #4 

For my forth test I grabbed one of each of my batteries and put them in a bag and put them in the freezer for 24 hours and then in a warm spot for 24 hours and then again two more times and then put them into the battery tester at room temperature to discharge at 600 mA and checked the charge on them every 20 mins .

• From my observations batteries work in hot and cold temperatures. 
• Batteries work in temperatures from 20 degrees to -10 degrees C. 
• I observed that batteries work better in warmer weather conditions and don't work as well in colder conditions. That’s because they run out faster and have less capacity in colder temperatures.
• I also found out that the more expensive batteries work better than cheaper batteries but because the time and capacity difference wasn’t as much as the price difference the cheaper batteries are actually better value for the money.

• From my observations batteries work in hot and cold temperatures. 
• Batteries work in temperatures from 20 degrees to -10 degrees C. 
• I observed that batteries work better in warmer weather conditions and don't work as well in colder conditions. That’s because they run out faster and have less capacity in colder temperatures.
• I also found out that the more expensive batteries work better than cheaper batteries but because the time and capacity difference wasn’t as much as the price difference the cheaper batteries are actually better value for the money.

• Brand name batteries work better than underrated batteries, but since they can be quite a bit more expensive it doesn’t always make sense to buy the brand name batteries.
• batteries at room temperature work better than at cold temperatures.
• When you cycle the batteries from warm to cold in and out of the freezer a few times and test the batteries at room temperature the batteries test just as good as the batteries that were not cycled. 

• Remote locks on our house use batteries and need to work in warm and cold temperatures.
• Christmas decorations need to work indoors and outdoors and lots of decorations use batteries.
• Flashlights work in the house and also outside when I go camping or look for things in the garage.
• Car batteries need to work in hot and cold temperatures and sometimes they go from the outside where it’s cold to a parking garage where it's warm all in the same day.

• When cycling the batteries in hot and cold using the freezer might have not been the best because people open and close the freezer.
• There are many batteries in a pack and it's not guaranteed that all the batteries work the same. I could have tested more of the batteries to see if the all acted the same.
• The position that the battery was in the tester could have effected how well it did. The batteries in the middle might have been hotter than the ones on the ends.

https://theconversation.com/curious-kids-how-do-batteries-work-123023

https://kids.britannica.com/kids/article/battery/390651

Energizer MAX® Alkaline Batteries - Energizer

https://www.wired.com/2012/01/are-expensive-batteries-worth-the-extra-cost/

https://discoverbattery.com/support/learning-center/battery-101/why-does-temperature-affect-a-batterys-available-capacity