|Here are some basic things you should always consider when choosing a new battery! Do not follow the hype train!|
|First: use the right stats! Do not only look at the ranking table!|
Compare batteries by comparing them head to head in the dynamic race test! The 80A and 60A are only online more as a background information for deeper understanding, a static load test will never reflect the performance of the battery under realistic conditions! Do never decide just because of some static tests, always look at the dynamic race test first! The dynamic race test, that is generating the score, is a realistic race and does show the real life performance.
A static load test will just show you how fast the voltage goes down, but not how fast the voltage does recover! Only the race test does include all, resistance against voltage drop, and how fast the voltage will recover! And do not only watch at the ranking, this is just a pre-selection. If you watch 2 batteries head to head in the race test, you can see which one will perform better at the beginning, the mid section and the end of a race.
Second: close score in the ranking
Most Pilots will not feel any difference between batteries in a blind test if the score is only 100-150 points off from each other. I like to let pilots fly batteries where they do not know what brand I did mount to the quad. Suddenly they judge by performance, and not any longer by brand/marketing. There are many really close batteries in the ranking. You are free to choose.
Third: weight and price
Beside the ranking, take a look at the weight and the price! Especially the weight is something to consider, but also the price is a really important point!
Fourth: Think, then buy!
Do you really need a specific kind of battery? Is your setup really so hungry? Do you have the skill to take advantage of a specific pack? Not every Pilot will need or can use a 40€+ battery. Do not just buy a expensive battery because of a hype train! Choose what you need! Maybe a set of cheeper but still great batteries will keep you longer in the air.
|How long does it take you run a full battery test, and what is the sequence?|
| This is a question I do get quite often now. So I´ll write down the whole sequence of a full battery test and will then just link to this post whenever I see this question again.
Please understand this as an explanation why It takes a few days between releasing a new result. (Do only read if you need to know. It´s boring and long. :-) )|
First, I do get no money for this, I do this test in my free time beside my hobby and family. While doing this tests I can not do anything else like flying, building etc. because I have to keep an eye on the batterys while the tests are running most of the time, at stage two at all time. (I already had one battery blowing up while the race test. :-( )
Stage one: preparation ~4 hours :
Incomming inspection (check for defects), weight etc. Break in cycles: Every battery is charged and discarged carefully for preparation 4 times (with time to cool down before charging).
Stage two: Load tests ~8 hours:
The battery will be charged, and then is going to the tempering cabinet at 25°C for one hour. Then the 30A test is running. After the test is done, and the battery is cooled down to room temperature, the battery is charged again, tempered at 25° and then the 60A test is running. The same for the 80A test, and at last the race test. So this stage will take about 8 hours, and i usually do this in 2 evenings, but always in this sequence (30A to race).
Stage tree: IR curve ~ 6 hours:
The battery will be cooled down with the tempering cabinet to 10°C, this will take about 1 hour, and then the battery has to rest at the temperature for about another hour until the whole battery has reached the 10°C and the IR is not changing anymore. Then the measurement is done, and the cabinet is going to 25°C and will stay there also about one hour undtil the IR is stable. And then the tempering is done with 40°C and 55°C. Every temperature takes time to reach and then one hour to reach the temperature in the cells of the battery. Here I only have to carefully watch while heating up to 55°C, because this is the dangerous part. ;-)
So, all together I try to run one full test at ~4 evenings. If I do post that I have a new battery, this is the fastest I can do. I usualy do 2 batterys togerther, some times 4, but then the waiting times will be longer, so I prefer doing 2 togerther. Why the effort? THIS is the whole reason I did start Lipobench! I wanted repeatable and compareable tests. With batterys that do change the performande so quick with changing temperatures, you have to get that temperatures under control.
Here is a post to show you how the performance of a Lipo is changing with different temperatures, and why the temperature is so importand if you want a repeatable test setup. The race test would be worth nothing without the same starting temperature!