opinions about batteries....

[zeropointbug]

http://www.beatyourtruck.com/forum/s...a-Maxamps-pack

Looks like SuicideNeil posted a discharge graph on beatyourtruck.com forum. The Gens Ace pack definitely outperforms the MA pack, and cost 1/4 the price.

[BrianG]

Hmm, I wonder why MA hasn't threatened that site with litigation? After all, it's against the law to speak the truth.

[FG101C]

I was thinking of getting a Hyperion G3 pack for my Truggy. Looking at the 4200mah 5s pack. Should I go VX or EX? VX should be enough right, no way a Truggy is going to pull 147 amps continuous would it? This is a track only vehicle.

Thanks.

[RC-Monster Mike]

I use the 4200mah VX 35/65c Hyperion packs in my buggy and truggy race trucks - awesome packs.

[crazyjr]

Originally Posted by zeropointbug

THat's interesting, it seems like old school lipo's are made with a more stable chemistry as far as calender life is concerned if what you guys are saying is true.

Anyone else have some old (6+ years) packs that are still perform strong? Post it here.

BTW, a good pack these days will hold a 20C discharge at ~3.7v/cell (at mid discharge) or how about 3.5V @40C discharge.

Graph from everydayflyer from RCGroups.

I have some packs from around '05 to '06, they're the only packs i have left. When i started with Lipo, I had 2 2s and 2 3s maxamp 8000mah lipos, 2 2s and 2 3s hyperion twenty 20c 3700 lipos, 2 and 1 4s 3700 flightpower 20clipo 1 4900 flightpower 20cand 1 5s 2500 flightpower 20c. Of all them, bought around the same time (within a few months), the maxamps were bloated within the year (all from sitting at storage charge, none swelled during a run) All the flightpower and hyperion are still running and running hard. I store them at full charge, sometimes 6 months at a time, and none have failed. Here's my take, If you plan to use and maintain them, you can get cheaper and be happy, If like me you tend to be a bit lazy, Invest in higher quality, They are more forgiving. This might not apply to newer packs, Mine are all over 6years old

Originally Posted by brandonwilcox

I recommend quality over cheap batteries that won't last as long. MaxAmps.com is a great option:

http://www.maxamps.com/

I don't know if i'd still be into RC, if Maxamps were the only battery available. No thanks.

[zeropointbug]

Originally Posted by FG101C

I was thinking of getting a Hyperion G3 pack for my Truggy. Looking at the 4200mah 5s pack. Should I go VX or EX? VX should be enough right, no way a Truggy is going to pull 147 amps continuous would it? This is a track only vehicle.

Thanks.

Looking at discharge graphs from everydayflyer on RCGroups, who has done hundreds of cycles on many different brand packs; the EX G3's look like they have pretty good increase in punch over the VX packs, which already are awesome packs. I have am about to purchase some 6s 2200 45C EX packs for racing this year, he shows these packs have a ~2.0 mohm per cell IR, compare this with ~1.4 mohm per cell IR for the 4200 35C VX packs which Mike just mentioned. Really though, if you are going to get a medium to large pack, then VX is plenty... the only reason I went with EX is because the pack is quite small, and I will be using up to 40C peak draw.

Lower cell IR = performance

[zeropointbug]

Nuf said about MaxAmps I think, they suck, plain and simple...

[zeropointbug]

Originally Posted by BrianG

Hmm, I wonder why MA hasn't threatened that site with litigation? After all, it's against the law to speak the truth.

Isn't that true.

[zeropointbug]

http://www.rcgroups.com/forums/showthread.php?t=1242354

Here is the thread on a G3 EX 45c 2200 pack, lot's of graphs.

It can hold 3.5v/cell @ a 40c + discharge; and @ 23c discharge, it's only 122F, that's 2.5 mins from 100% to 90% DOD. It appears, looking through his other battery tests, the 2200 size pack (and maybe 2600) have the highest performance per mah capacity in the G3 line up.

[crazyjr]

Does anyone know If Hyperion and flightpower are still enerland based?

I wish Mike still had the ones he was having made, They were the real bang for the buck for quality and performance

[zeropointbug]

Nope, I can't remember the manufacturer name, but if a user on RCGroups is to be believed, he said Hyperion and TP use the same cells. I am just going on what he said, this sort of information is sort of kept on the down low.

[zeropointbug]

Going through Everydayflyer's post on battery testing, if I am reading the graph accurately, it looks like Hyperion 45C EX packs actually outperform the TP 65C packs. Check it out, tell me if I am crazy. If you want, go back and look at the 90A G3 graph I posted a couple pages back...

[nativepaul]

Two quotes from Charles on RCG:-

Re TP 65c 2250mAh:

IRs approx. 1.6 but they are still dropping. They were 2.3 after the first 4A charge form storage.

Re Hyp 45c 2200mAh:

3rd.Chr. on Cell Pro 10 at 5A IRs 3.6 / 3.7
4th. Chr. Cell Pro 10 at 7.2A 2.6 / 2.7

And a quote from you on page 2 of this thread:

Pack IR is actually the only story as far as performance goes.

If you are both right, the TP pro power 65c cells are about 50% better than the Hyperion EX G3 45c cells. The graphs don't shout that out to me, but maybe its the comparison between 2s and 3s packs, and the fact that the 2V or so that we're concerned with occupies so little hight its not easy to compare them.

[zeropointbug]

Okay, sorry for not seeing him saying they were 1.6 IR for 65C, but again, those are pre-production samples, and most likely selectively picked for testing. The G3 45c pack has 2.1 IR after a few cycles on them.

I don't know if Charles graphs are not calibrated or something, but you look at the actual number on the graph at a given discharge current, but the G3 45C pack is holding a higher voltage PER CELL. 1.6 IR for a 2250mah pack is simply amazing though... my 4200 35C G3 packs were 1.33 IR, almost twice the size pack.

Originally Posted by zeropointbug

THat's interesting, it seems like old school lipo's are made with a more stable chemistry as far as calender life is concerned if what you guys are saying is true.

Anyone else have some old (6+ years) packs that are still perform strong? Post it here.

BTW, a good pack these days will hold a 20C discharge at ~3.7v/cell (at mid discharge) or how about 3.5V @40C discharge.

Graph from everydayflyer from RCGroups.

Hmm... quite funny I was thinking that my older LiPo's were better than my newer packs somehow. In 2008 I think I bought some Rhino's (at that time they were the high-quality packs at Hobbyking. Is it still like that now?), 1350mAh rated for 30C continious (= about 40A). They've seen lots of 80A+ spikes and the cells reached 2.7V per cell. Now, 4 years later, they're doing nothing in my hobby room with no single cell puffed. And as far as I remember, they always performed awesome during I was abusing them.

I'm very careful with my newer Turnigy packs as I'm afraid one of them will start to burn out of nothing and take out my house as well. So I always put them in a LiPo bag in the garage on a stone floor. But those old and abused Rhino packs lie in my house, without LiPo bag, on a wooden table and I'm very confident nothing will happen with them. It might sound very funny but I'm so scared of my new LiPo's...