Is Maxamps any better now?

Not had much luck with Maxamps packs in the past, but I was wondering if their new line of 30C and 35C packs are accurately rated? Anyone tried these higher C packs yet?

[George16]

I have no experience with Maxamps but based on other choices of batteries out there such as PQ, TP, Zippy, Neu, just to name a few, I would just play it safe and buy one of these brands. I'm using PQ and Neu batteries and they have never let me down.

[starscream]

Originally Posted by George16

I have no experience with Maxamps but based on other choices of batteries out there such as PQ, TP, Zippy, Neu, just to name a few, I would just play it safe and buy one of these brands. I'm using PQ and Neu batteries and they have never let me down.

Without having any experience with these batteries its impossible to say how they fair, especially if we do not know who the manufacturer of the cells are.

The prices of these packs seem pretty comparable to most other lipo's so I'd say, for those prices, they'd better perform up to par.

[George16]

Originally Posted by starscream

Without having any experience with these batteries its impossible to say how they fair, especially if we do not know who the manufacturer of the cells are.

The prices of these packs seem pretty comparable to most other lipo's so I'd say, for those prices, they'd better perform up to par.

Give those Maxamps a try and post your findings here.

http://www.nitrokillers.com/showthread.php?t=1527 Here is there own graph of there 35c 4200.It's still weaker then they are claiming.It's rated at 147amps for 4200.It took 120 amps for 3500.Thats just a single cell,with cooling.In pack form it's probably a 4000mah 25c .Way better then the old ones,but still not accurately rated.

[BL_RV0]

I'd bet they still have the puffing issues the older ones did.

[sikeston34m]

Originally Posted by asheck

http://www.nitrokillers.com/showthread.php?t=1527 Here is there own graph of there 35c 4200.It's still weaker then they are claiming.It's rated at 147amps for 4200.It took 120 amps for 3500.Thats just a single cell,with cooling.In pack form it's probably a 4000mah 25c .Way better then the old ones,but still not accurately rated.

It was holding 3.1 volts for about 25% of the discharge cycle?

A 35C rating? This graph isn't even a 30C discharge.

This graph shows an overworked cell trying to keep up IMO.

Companies that over-rate their cells say, "OK here's what it will do" falsely. Then the consumer believing it will perform as stated, puts the pack in the high discharge device and runs it as such.

Then puffing occurs.

There should be a standard for the "C" rating for a given pack. Controlled conditions and a rule that says "For a given C rating the pack must hold at least "X" volts per cell for 75% of the discharge cycle and come out no hotter than "X"


I'm looking at a different brand discharge graph here for a 3500mah rated at 30C.

At a 33C load (115.5 amps), it maintains a cell voltage of 3.3 volts for 75% of the discharge cycle. It still dumps 90% of its capacity before hitting 3.0 volts per cell.

A little under rating can be a good thing.

[BrianG]

Originally Posted by sikeston34m

...There should be a standard for the "C" rating for a given pack. Controlled conditions and a rule that says "For a given C rating the pack must hold at least "X" volts per cell for 75% of the discharge cycle and come out no hotter than "X"....

I TOTALLY agree! There was a thread about this very subject a while back. There is no standard so makers are free to say whatever they want as long as they can justify it later on in some fine print.

And, to lend credibility to any claims, all testing/rating should be done by a thrid party.

Maybe someone on here knows.How did the c ratings come to be used as the standard?Why do they not just use amps?I think it would make our lives so much easier if they said ,100amps constant for 5000mah,before hitting a 3.2volt cutoff.

[sikeston34m]

Originally Posted by asheck

Maybe someone on here knows.How did the c ratings come to be used as the standard?Why do they not just use amps?I think it would make our lives so much easier if they said ,100amps constant for 5000mah,before hitting a 3.2volt cutoff.

I believe this is because they want us to understand a couple of things.

Amperage output is affected by capacity for a given "class" or C rating.

A 20C 4000mah pack will put out 80 amps continous where as a 10C pack will put out half of that. You can play with the numbers but the formula remains the same.

To obtain a higher C rating, manufacturers use a greater anode/cathode material to Electrolyte ratio. This is why the higher the c rating, the more they weigh for the same capacity.

It's the use of more Anode/Cathode material in the higher C cells that increases the cost.

I believe most manufacturers don't falsely rate their cells. This is their reputation. But............then the product gets passed to the retailer. It then gets "labeled".

I can just imagine some thoughts like:

Most users won't push these that hard anyway.

The RC Electric setups on the market can't handle more than these put out.

If we charge more, the added profits will cover warranty claims for those that do push them. It's only gonna be a small percentage, plus we can blame it on their setup and suggest larger more expensive packs that we carry. More Sales! It's a win-win.

In the beginning of the "transition" from Nimh to Lipo in the RC Industry, I believe this was pretty easy to get away with.

It's getting tougher, as the market competition increases. The average prices are dropping and the cells are getting better.

Hey I've been reading post over many rc site trying to find the good setup for me. I need to be pretty sure of what I'm buying before doing so because I can't afford to make a mistake and waste 200$+ on battery or any other part I update on my e-revo. Brushless update cost so much!

I finally decided to order the tekno neu 1515 1y squared I'm gonna use with the MMM I got some months ago (wish it will hold down it's V1) and never used.

Now I'm looking for the right lipo to go with my kit. I've seen many and am pretty lost with all the post read. Here's the pack I am wondering about:

MA (yeah I know) 3s 5250Mah 30c x2 for 22.2v - about 350 they told me I could get 15% discount

Neu energy 3s 4900mah 25c x2 for 22.2v about the same price

A123 cell 4s 2300mah x2 in 4s2p setup with a 3rd pack of 3s2p for a total of 7s2p 23.1v 4600mah 30c. About 400$

I've been using home made a123 5s1p in my e-revo for some time and they miss a little punch, but that might be my soldering being pretty bad! ;) I heard well made pack have a lot of power.

Any of you have comments on my ideas, or other pack to recommend. Is the MA good even if they don't stand their claimed C rating or should I go with something else ? I don't want to hijack the trade but u seems to know what u're talking about in here!

Thanks for your help!

Originally Posted by Laethageal

Hey I've been reading post over many rc site trying to find the good setup for me. I need to be pretty sure of what I'm buying before doing so because I can't afford to make a mistake and waste 200$+ on battery or any other part I update on my e-revo. Brushless update cost so much!

I finally decided to order the tekno neu 1515 1y squared I'm gonna use with the MMM I got some months ago (wish it will hold down it's V1) and never used.

Now I'm looking for the right lipo to go with my kit. I've seen many and am pretty lost with all the post read. Here's the pack I am wondering about:

MA (yeah I know) 3s 5250Mah 30c x2 for 22.2v - about 350 they told me I could get 15% discount

Neu energy 3s 4900mah 25c x2 for 22.2v about the same price

A123 cell 4s 2300mah x2 in 4s2p setup with a 3rd pack of 3s2p for a total of 7s2p 23.1v 4600mah 30c. About 400$

I've been using home made a123 5s1p in my e-revo for some time and they miss a little punch, but that might be my soldering being pretty bad! ;) I heard well made pack have a lot of power.

Any of you have comments on my ideas, or other pack to recommend. Is the MA good even if they don't stand their claimed C rating or should I go with something else ? I don't want to hijack the trade but u seems to know what u're talking about in here!

Thanks for your help!

you could get Zippy lipos which perform better than MAs for half the price, my suggestion is to run a 1515/2.5d or 1.5y with either 6s lipo or 7s A123 and gear it for 40-45 mph

I have run thier packs before and I will never give them a second chance, I buy either FPs or Zippys. I am interested in the new EON line that FP has, they are supposed to have twice the power and come in a lighter package.....we'll see how that turns out

[Takedown]

Ive owned a couple maxamps packs when I was a newb to lipo. I used two 5000mah 2s from them. I have to say they worked pretty good. No offense to what you guys have said against them but my one issue with them is prices. For the price of maxamps just go with the trusted names such as thunderpower, flightpower, neu energy, True RC, enerland, polyquest etc...

[redshift]

You have to wonder what kind of backroom deals were made for that to happen, maybe only MA employees were polled, I have a picture in my head much like the ROAR-Novak bedfellow situation. Maybe it was the flames on the label that wooed em... people just love image don't ya know.