Ways to protect MMM when used with subpar batts

[DwightSchrute]

so here's the other question....noting that there is no real standard for testing a C rating and eagletree data sometimes shows these "lower end" packs are a hit or miss, isn't there a determining factor to be considered in MAh too?

for example: X pack is a 10,000 mah 15C pack.... and then you have a 25C 5000mah pack, dosen't the mah have a determining factor for applied power almost the same as the C rating? this, to me is a confusing formula simply because my cheap 10,000mah 15C pack out performs my "high end" 5000mah pack with very similiar cycles.

this makes me hesitate to buy the "higher end" packs that are rated 25-35C but are sometimes below the 5000mah mark. at that point aren't you just splitting hairs between the "lower end" packs and the "higher end" packs?

if someone could explain that one to me it would help clear up alot of confusion.

[lutach]

Originally Posted by DwightSchrute

so here's the other question....noting that there is no real standard for testing a C rating and eagletree data sometimes shows these "lower end" packs are a hit or miss, isn't there a determining factor to be considered in MAh too?

for example: X pack is a 10,000 mah 15C pack.... and then you have a 25C 5000mah pack, dosen't the mah have a determining factor for applied power almost the same as the C rating? this, to me is a confusing formula simply because my cheap 10,000mah 15C pack out performs my "high end" 5000mah pack with very similiar cycles.

this makes me hesitate to buy the "higher end" packs that are rated 25-35C but are sometimes below the 5000mah mark. at that point aren't you just splitting hairs between the "lower end" packs and the "higher end" packs?

if someone could explain that one to me it would help clear up alot of confusion.

The mAh of a pack is simply when they are discharged a 1C. All the C ratings do as of now, is make a certain pack look good for marketing purpose. I know various places that makes cells and they get pushed to make all the powerful cells without much test. Some if not most of the brands out there will most likely always go for the cheaper manufacturer to make more profit (Nothing wrong with that). How do they test the packs afterwards, who knows. If the people I've contacted yesterday are up for the idea I have in mind, we will find out soon enough what's real and what's bogus. It should also teach a lesson to all the over rated items in our Hobby. The only problem is, if there's still uneducated people out there always talking about the numbers, there will always be over rated products.

Example: A guy that drag races RCs went to my LHS to buy a brushless top of the line LRP esc. I was there with my ESC and offered to let him use it. He asked what's it rated for and I told him 200A burst continuous. He said the LRP was 400A per phase and I told him the rating they use is just to make it look good and I told him that no RC battery will be able to deliver such AMPs. Well he spent $200+ on the LRP and I guess it didn't work as he came back a few days later trying to return the ESC. So I offered him my ESC again and this time he said he was making his own, but I never seen it. I should've told him the specs on my ESC using the pulse AMP rating was 250A X 3 = 750A. I guess some people just don't have common sense and lack of knowledge nowadays.

[BrianG]

Originally Posted by lutach

...Example: A guy that drag races RCs went to my LHS to buy a brushless top of the line LRP esc. I was there with my ESC and offered to let him use it. He asked what's it rated for and I told him 200A burst continuous. He said the LRP was 400A per phase and I told him the rating they use is just to make it look good and I told him that no RC battery will be able to deliver such AMPs. Well he spent $200+ on the LRP and I guess it didn't work as he came back a few days later trying to return the ESC. So I offered him my ESC again and this time he said he was making his own, but I never seen it. I should've told him the specs on my ESC using the pulse AMP rating was 250A X 3 = 750A. I guess some people just don't have common sense and lack of knowledge nowadays.

The guy didn't realize that the 400A rating was effectively bogus, and now he is going to make his own ESC?!?! Talk about trying to fly when you don't even know how to crawl!

[lutach]

Originally Posted by BrianG

The guy didn't realize that the 400A rating was effectively bogus, and now he is going to make his own ESC?!?! Talk about trying to fly when you don't even know how to crawl!

I know, but it's his money lol. I told him to even get the MM as it was in stock and proven in many record set ups. It's been a couple of years now so my best guess is that he didn't want to look like a moron.

[DwightSchrute]

Originally Posted by lutach

The mAh of a pack is simply when they are discharged a 1C. All the C ratings do as of now, is make a certain pack look good for marketing purpose. I know various places that makes cells and they get pushed to make all the powerful cells without much test. Some if not most of the brands out there will most likely always go for the cheaper manufacturer to make more profit (Nothing wrong with that). How do they test the packs afterwards, who knows. If the people I've contacted yesterday are up for the idea I have in mind, we will find out soon enough what's real and what's bogus. It should also teach a lesson to all the over rated items in our Hobby. The only problem is, if there's still uneducated people out there always talking about the numbers, there will always be over rated products.

Example: A guy that drag races RCs went to my LHS to buy a brushless top of the line LRP esc. I was there with my ESC and offered to let him use it. He asked what's it rated for and I told him 200A burst continuous. He said the LRP was 400A per phase and I told him the rating they use is just to make it look good and I told him that no RC battery will be able to deliver such AMPs. Well he spent $200+ on the LRP and I guess it didn't work as he came back a few days later trying to return the ESC. So I offered him my ESC again and this time he said he was making his own, but I never seen it. I should've told him the specs on my ESC using the pulse AMP rating was 250A X 3 = 750A. I guess some people just don't have common sense and lack of knowledge nowadays.

this is exactly what i mean. it's been supposed more than once that some of the "high end" manufacturers and some of the "low end" manufacturers are all getting their packs from some of the same places and it's getting very difficult to determine what's inflated and what's real.

some day, there is gonna need to be a standard of testing these numbers.
example:. my lhs has stopped carrying one of the top battery companies because he said they switched manufacturers to save money and they have been getting a ton of warranty claims. he went on to say they used to be a very trusted company and now he wouldn't put one in his heli if it was the last battery on earth. so who do you trust?

[lutach]

Originally Posted by DwightSchrute

this is exactly what i mean. it's been supposed more than once that some of the "high end" manufacturers and some of the "low end" manufacturers are all getting their packs from some of the same places and it's getting very difficult to determine what's inflated and what's real.

some day, there is gonna need to be a standard of testing these numbers.
example:. my lhs has stopped carrying one of the top battery companies because he said they switched manufacturers to save money and they have been getting a ton of warranty claims. he went on to say they used to be a very trusted company and now he wouldn't put one in his heli if it was the last battery on earth. so who do you trust?

I tend to look at what works and what doesn't work. To me the best lipos so far are from Kokam and Enerland. I haven't bought any of the new lipos jut because I have no clue who's making them and how well the technology is. I have gotten accurate answers from a few brands that have told me the 25C technology is mature and the other rating are not mature yet. One manufacturer wanted to send me a few samples, but I declined as I don't like to take chances.