You guys realize that you an overcharge "regular" batteries to gain an advantage. People do it all the time.

The big problem is that tracks don't tech voltage. You could allow 4.35/cell all day long but unless you tech voltage the guys will overcharge these as well.

For us who race modified touring cars, we even do not charge to the max allowed voltage. We often (indoor) only charge to 4.00 - 4.1 per cell to limit power.

Higher voltage lipos is in this respect totally irrelevant for us.

Only if they provide other benefits could they be interesting, but todays lipos, like LRP 5600 LCG's, are low, light weight, and we already have to add some 60-70 grams to meet minimum weight limit- And our car is in total balance.

Right now, I cannot see any benefits for mod racers like us.

I just wanted to post my thoughts on these LiHV batteries. I own Venom 2S packs, Gens ace 2S packs, and Trinity Carbon HC packs, and Traxxas 2S packs. All of these batteries are 3.7-4.2v ...

Well I charge them all to 4.35v per cell. They have all been more then 35 cycles charging to a 8.7 volts . No swelling, no problems whatsoever!

If your charger allows LiHV then go for it. 4.35v per cell.

LiHV is a 7% increase in power.

Motors such as 21.5 are being used to slow down cars. What's the logic to change rules to allow higher voltage batteries?

HV have higher voltage discharge curve, no way a regular legal battery (even if overcharged) can compare in performance.

I charge my standard voltage lipos to 4.35 volt per cell. The point in this is easy..

Lipo shut off voltage is 3.2v, well when they are charged to 8.7v for a 2S pack the pack is completely depleted with the voltage at 3.40-3.50v volts so the vehicle has more performance! And it runs in the nominal 3.7-4.2 Lipo voltage for longer then a standard Lipo.

Try charging your lipos to 4.35V per cell it's a nice boost and maintains higher voltage throughout the whole cycle.

You can charge any Lipo to 4.35v per cell. Do not buy in to the LIHV...

Wouldn't everyone love if there packs stayed at 4.2 volts through the whole cycle? Well that won't happen but, you will gain a little and the battery will shut off at 3.4 volts. Instead of a weaker 3.2 volts.

Thanks all for that info.

Low CG, and low battery weight seems to be the trend nowadays... I ran 208gram TP packs in 17.5t blinky and had way better results than running a 300+gram pack, even with the so called end of run fade...

Probably the worst advice I seen so far on this forum. If you got money to throw out the window for batteries and a bullet proof liability insurance go charge your lipos to 4.35V. Just because you didn't burn down anything yet, doesn't mean it's safe. For all the sane people it's actually recommended to charge till 4.18V, your batteries will last much longer with good performance. Again if you want more power just get a stronger motor.

Some of the early lipo chargers were set at 4.3V/cell. It was quickly discovered that 4.2V provided significantly improved cycle life with similar performance. The extra Voltage quickly dropped off.

Are these packs really any different? Or is the since improved cell life just being used to go back to the future?

I'd expect any pack to recover, bounce back up a bit, and measure at a higher Voltage than the lipo cutoff is set at.

Then don't use the advice, speaking of throwing money out the window, wouldn't that be what someone is doing spending $150 on a HV battery to charge it a additional 0.15volts.

We live in a world where things can be pushed to save money, because we want more power! My 3.3ghz i7 CPU is overclocked to 4.8ghz, with additional voltage and cooling. All of this for the cost of nothing. Because I can, my choice.

I put in my 2¢ I charge all of my batteries to 8.7volts, or 4.35 with no adverse affects.

I tested this on a few puffed 6 year old Turnigy packs.

I de puffed them, popped a hole with a toothpick, put it in a press gasses came out, and I hot glued the hole. These batteries are like new again.

A few have over 100 cycles without puffing. Lipos are a hit or miss, and we abuse them already as it is.

If you get a 100 cycles on a $30-$50 battery and it dies, you just about got what you paid for.

If you're worried about charging a standard Lipo to 4.35v, then please do not try this.

I have a certified Trinity battery I do not overcharge they run over $200 a piece and I choose not to so I can get 200-300 cycles.

The main purpose for going to the Hv cell is to allow better stability over time if you only charge to 4.2v/cell. A previous poster hit on this as well.

We are not selling these packs and endorsing charging to the higher voltage to gain a performance boost.

We already know the rules are changing in 2017 and are getting prepared for what's next.

Anyone charging above 4.20v/cell is doing so at their own risk.

As you may know all the things you mention to push the limits is at own risk. Overclocking processors... I have done that a lot in the past, did love the Celleron 266 running on 400MHz by just changing the FSB from 66MHz to 100.
With todays machines there is no need to overclock but if you do, you will notice the limits and make a step back or you did fry a processor and will cost you a new one.

With LiPo the highest savest voltage is 4.3v. If you go beyond that there is a high risk because LiPo cells can get unstable. If a cell gets fire and you have taken no safety then with burning down your house, garage and/or car is no way back. For sure when the insurance finds out you were charging LiPo's beyond the limits (as they can read here) you will have a financial problem.....

So what is suppose to happen to the rules in 2017?

Pretty sure he is referring to IFMAR allowing the use of HV cells starting in 2017 BUT from my understanding you'll still only be able to charge to 4.20 per cell.

EA

Yes, all major racing organizations will allow the use of 7.6v batteries as long as they are charged to 8.40v. I know IFMAR, EFRA, and ROAR have already voted in the rules to allow this in 2017. I think BRCA is adopting this also.