Revolectrix announces industry-leading Blend435 series LiPos

[hemp]

As they did last year with the industry-first 4.27V (per cell) LiPOs, Revolectrix has once again broken through a wall by releasing the first 4.35V LiPOs with the highest energy densities on the market. Increasing the energy density of each cell is an efficient means to increase power without adding significant weight.

Currently in a limited range (targeting longer flight times) the available lines are Black Label 30C and Platinum Label 40C.

Please note that some electronics are designed with max voltage ratings based on 4.20v per cell. It is recommended to check your equipment for compatibility before attempting to run at higher voltages.

[mkovalcson]

The mah ratings are obviously made based on the additional capacity, but it definitely helps drop the battery weight so that's great!

I am curious how this will impact governor settings in terms of what percentage of throttle should be specified with these batteries.

It seems that unless you switched over to these exclusively that you would need to keep multiple sets of throttle curves.

Thoughts?

[hemp]

Originally Posted by mkovalcson

It seems that unless you switched over to these exclusively that you would need to keep multiple sets of throttle curves.

Thoughts?

That would depend on the governor. In my case I run VBar gov mostly and it targets a predefined motor speed so adjusts accordingly. YGE and Kontronik governors have a "Gov Store" mode which effectively tries to do the same thing (compensating for differences in packs) which is the mode I've always run them in. So for me personally the answer is I really haven't had to think about it. However that doesn't negate the point.

The effect would vary depending on the Kv of the motor and the gearing. Higher Kv = larger impact from increased voltage. So on some machines it might be more of an issue than others. All I could really say for practical purposes is try it and see what result you find. Worst case, you decide the change in headspeed is a problem and not worth the hassle to resolve so you only charge these packs to 4.2v -- now you're "stuck with" very high quality packs that will live longer since they're never being charged to their max capacity.

[mkovalcson]

Originally Posted by hemp

- now you're "stuck with" very high quality packs that will live longer since they're never being charged to their max capacity.

That's not exactly the whole issue.

The mah rating of those batteries is based on 4.35 V and not 4.2 V so you would be penalized by shorter flight times.

That said I run Kontroniks across the board.

[hemp]

Originally Posted by mkovalcson

The mah rating of those batteries is based on 4.35 V and not 4.2 V so you would be penalized by shorter flight times.

That's true, but as a matter of semantics I would argue for trade-off versus penalty. Revolectrix encourages running all LiPOs at less than their full capacity because they don't think the few extra seconds of flight time is necessarily worth the decreased cell life. That's why all Powerlabs come with Long Life presets turned on by default.

Not that I do that personally. I've always been hard on my packs - but I know that and I don't complain if they fail to live up to unreasonable expectations. That said, even with consistent abuse I have some 6S 5.5Ah SilverHV packs going on 165 cycles at 14 months and still under 2mΩ max IR.

[jchen]

What is the max voltage for say a Castle & Helijive esc &
would it compromise relaibility of the esc ?

Thks

[Ace Dude]

Originally Posted by jchen

What is the max voltage for say a Castle & Helijive esc &
would it compromise relaibility of the esc ?

Thks

I would recommend asking your ESC manufacturer directly.

[Rob43]

Mark - are you really saying that by specifying the Formula 427 packs in terms of mah, they have actually determined the amount of mah needed to provide equivalent watt-hours when compared to a given equivalent c-rated 420 (ie, traditional) pack? I was wondering this when viewing the specs. About 20% lighter.

[hemp]

He's saying (correctly) that the mAh printed on the label includes the additional energy from increased voltage.

In other words, a cell that previously would have been 5000mAh charged to its max of 4.20v, after applying the new blend, would now be 5500mAh charged to its new max of 4.27v. It weighs a little more because of the additional process and has higher capacity.

That's a purely hypothetical. I don't know that it's true to life, but it captures the concept.

[Gregor99]

Originally Posted by hemp

He's saying (correctly) that the mAh printed on the label includes the additional energy from increased voltage.

In other words, a cell that previously would have been 5000mAh charged to its max of 4.20v, after applying the new blend, would now be 5500mAh charged to its new max of 4.27v. It weighs a little more because of the additional process and has higher capacity.

That's a purely hypothetical. I don't know that it's true to life, but it captures the concept.

Put another way, if you charge a Blend427 pack or Blend 4.35 pack to only 4.2v per cell, you've actually undercharged the pack. Just as with under charging a regular LiPo, the pack will provide less mah during discharge. To achieve the specified pack capacity, they need to be charged up to 4.27v or 4.35v.

[Trader]

Originally Posted by Gregor99

Put another way, if you charge a Blend427 pack or Blend 4.35 pack to only 4.2v per cell, you've actually undercharged the pack. Just as with under charging a regular LiPo, the pack will provide less mah during discharge. To achieve the specified pack capacity, they need to be charged up to 4.27v or 4.35v.

Is it TRUE?

or

Is it hypotetical?

Thx,
Laci

[hemp]

Originally Posted by Trader

Is it TRUE?

or

Is it hypotetical?

Question is a bit odd. Are you asking whether you can really charge them to 4.27v or whether the capacity is really higher when you do? That answer to both is yes.