I am wrong about MaxAmps.

[aqwut]

A small debate with Jason from MaxAmps have made me not want to bash about maxamps packs anymore... They are not the same cells as TrueRc nor I really thought they were using HeCell.. but they use China Based Tronics Electro Co. LTD cells.

Seems like the 20C continuous discharge rate is pretty accurate.. but I don't want to talk about the 25C discharge rate...

[johnrobholmes]

Depends on the cells used for the discharge, but that is the manufacturer I suspected for the past year or so based on form factor and weights. Straight from Jason's mouth? And all this time he kept telling me that maxamps makes them :D

[Serum]

It's nothing new true-rc packs are different? the sizes of the 4000 cells are different to begin with. They do offer the best bang for the buck though (TrueRC), it's about the same quality (voltage/current wise) for less than 1/2 the price.

[lincpimp]

Don't get me started on Jason, he really likes to back-pedal everything he says.

Unless their cells have become alot better in the last 6 months, they are not 20c cells. They may be able to produce that without puffing, but not while keeping the voltage over 3.5v per cell.

In any case, their prices are too close to hyperion, polyrc, polyquest, and flightpower. Neuenergy seem to be the cheapest enerland cell packs, and they easily outperform maxamps stuff.

Plus Truerc cells seem to be rated correctly, and that is my biggest issue with maxamps. They refuse to post data on their packs. They are just blowing smoke...

Thats ok, when large scale electric gets really popular and people are trying to run high draw setups in heavy vehicles, the truth will come out.

[johnrobholmes]

With the a123/enerland merger we are going to see a lot better pricing on enerland packs too.

[lincpimp]

Originally Posted by johnrobholmes

With the a123/enerland merger we are going to see a lot better pricing on enerland packs too.

That is interesting. Hopefully they do not drop the quality! Who bought out who?

[johnrobholmes]

I am pretty sure that a123 bought enerland,




Every dealer that had a line into enerland now has a pipeline into a123 now. With the change comes changes in pricing and possibly management objectives but not manufacturing. a123 is ahead of everybody else with li-nanophosphate, and the Enerland manufacturing is the same for lipoly. a123 aren't going to buy a big dog just to screw up the quality name.

[lincpimp]

Originally Posted by johnrobholmes

a123 aren't going to buy a big dog just to screw up the quality name.

I sure hope not!

[aqwut]

I was on another forum having a little debate with Jason... I tore up one of my 3 year old maxamp packs and did a search for the cells... a discharge graph of their 20C batteries weren't too bad.. until it saw the 25C discharge.. I was like, WOAOHH.. 25C, dropped below 3.0Volts, at about half capacity... But like I told him, for the $$$ maxamps wasn't for me.... WOw.. if A123 bought Enerland, that is crazy.... those are the only two batteries I'm using right now... I think prices went up for polyquest packs, only a few months ago they were about $50 cheaper from hobby-lobby...

[suicideneil]

Do you think we might be seeing prismatic a123 cells in the future then, would be nice....

[johnrobholmes]

Originally Posted by aqwut

... a discharge graph of their 20C batteries weren't too bad.. until it saw the 25C discharge.. I was like, WOAOHH.. 25C, dropped below 3.0Volts, at about half capacity... .

That is normal for pushing a cell to hard continuously. What I see is a difference in the average voltage throughout the pack (at rated discharge). Tronics hang around 3.25v/cell whereas enerland is right at 3.4


Pink is the continuous rating.

[aqwut]

The Bottom two graphs would be a fair comparison..

25C continuous Rated pushed to 30C..


22C Continuous Rated Polyquest pushed to 25C..


20C Continuous Rated Tronics pushed to 25C..

[johnrobholmes]

If we wanted to make an assumption, we could say that enerland under-rates their packs in comparison to tronics. We could also say that the given tronics battery might be better rated at 15C if amperage overhead is wanted.

What would be more useful to us is burst graph - How hard of a one second burst can they take.


Take a look at the 1200xp graph. The voltage actually rebounds on the green and pink lines. That is from the cell heating up as it goes through the cycle.

[zeropointbug]

Yeah, there isn't any real hard evidence graphs out there that accurately shows the differences between each pack/cell type/chemistry. Because, for cars and trucks, burst performance is all that matters, right?

I am also very glad A123systems merged with Enerland. This should bring about almost revolutionary battery tech to RC market hopefully.

[aqwut]

JHolmes... I saw a bunch of guys race and they kept their Lipos nice and warm.. I know that lipos do not perform too well when cold...

I really do hope A123 and Enerland comes with some new technology... Maybe something like the April fools Joke... GumLiPo..