Revolectrix

[kfxguy]

By the way....what amp does everyone charge theirs at?

[Peter A]

Now you mention it, I did notice that the motor/esc were cool, more so than normal, it was hard to detect any warmth in them and the batts were just warm to touch.
I pretty much always charge at 5 AH.

[785boats]

By the way....what amp does everyone charge theirs at?

I guess I'm still old school & generally charge all batteries at what ever their capacity rating is (1C). So for these, 5.5A.
But at the track, if I'm forced to charge between heats it is at 2C of what ever battery I'm charging.

[kfxguy]

Now you mention it, I did notice that the motor/esc were cool, more so than normal, it was hard to detect any warmth in them and the batts were just warm to touch.
I pretty much always charge at 5 AH.

Yea, my motor barely gets warm and my esc feels like it's at room temp with these batteries. ...

[Peter A]

Ordered another pair yesterday. That replaces all my 2s turnigys that have crapped out, well to be fair they have had a hard 2-3 years!

[ray schrauwen]

2C on race days for speed, 1C otherwise. No need to work them any harder than you require.

By the way....what amp does everyone charge theirs at?

[flraptor07]

By the way....what amp does everyone charge theirs at?

5amp. for these

[grsboats]

I like to charge my batts always 10% lower than their capacity......they've been lasting good after three years.Gill

[drwayne]

Unfortunately our rule book only states a max NOMINAL voltage of 3.7V/cell not a max charge voltage. And because the sticker on the packs states 3.8V/cell NOMINAL, people here deem them illegal. Even though when only charged to 4.2V/cell the nominal voltage is still 3.7V. In fact John from Revolectrix has stated that even fully charged the nominal voltage is still really 3.7V. The sticker was to differentiate the HV packs from their other packs.
The lipo chemistry itself dictates the nominal voltage & the basic chemistry hasn't changed. It's just got a ceramic coating on the anodes that prevents gassing when charged to a slightly higher voltage. That's all.

Our AMPBA is looking to add some 'wording' to the rule book to cover this new technology. We'll have to wait & see if the wording allows them or bans them. It will be a sad day if they ban them.

Here are the current AMPBA rulings.. Ive made BOLD the important bits for this topic

2. PROPULSION BATTERY CLASSIFICATIONS
a. EA: The battery shall have:
i. up to 12 NiMH cells; or up to 4 LiPo cells (maximum battery weight of 650g)
ii. a maximum nominal voltage of 14.8V.
b. EB: The battery shall have:
i. 13 - 18 NiMH cells; or 5 - 6 LiPo cells (maximum battery weight of 960g)
ii. a maximum nominal voltage of 22.2V.
c. EC: The battery shall have:
i. 19 - 36 NiMH cells, or 7 - 12 LiPo cells (maximum battery weight of 1,950g)
ii. a maximum nominal voltage of 44.4V.

March 2011: FE Sub committee
Safety Statement
19 March 2011 Revision#3:
Sanctioned event, Club Race or Practice at AMPBA venues.
Electric: Safety
1. An externally fitted safety loop must be fitted which physically
disconnects battery from esc. One loop per esc is allowed An orange or
blue triangle ( >15mm sides) will visibly indicate this location.
2. The hatch/cover is not to be removed until safety loop is disconnected.
3. Electric class driver must remain on stand 'in control' until safety loop
disconnected [ usually as their boat is retrieved from water end of run or
during rescue ]
4. A returned boat must have the safety loop disconnected before removed
from launch/retrieval area
Rescue team:
1. Safety loop must be removed as boat is retrieved from water.
2. If a boat has uncontrolled movement , assess risk and act within the
following guidelines.
If safe to collect from water, do so and remove safety loop.
If not safe to collect from water, attempt safety loop removal via
rod or pole or paddle.
Safety is paramount, if the boat is deemed too dangerous for
rescue, protect the team and abandon rescue.
In cases where the boat is an unmitigated hazard , safely dispose of
the boat with whatever means available. Submerge with
pole/paddle guide away from shoreline ensure other water
users are aware the hazard.
Smoke fire etc ..
Li(xx) batteries can self combust if overcharged/overheated.
Cooling the battery is the best option to slow ignition.
During rescue the boat is to be treated as an uncontrolled boat.
If already in pits/shore areas, promptly notify all to evacuate the
area only that pit crew and safety crew are able to remain.
Removing safety loop may eliminate the cause, but not eliminate
the source
Quickly assess source and disable where possible.
Placing a smoking Li(xx) into a charge sack is an appropriate
measure.
If Li(xx) source not removable, cover with fire blanket or
submerge into water.
If fire exists, use fire extinguisher and/or cover source with
water/soil
Charging :
An appropriately manufactured and labeled LiSafe sack must be
used at all times.
An appropriate Lithium chemistry profiled charger must be used.
Batteries must be near air temp prior to charge.
Batteries must be balance charged.
Maximum charge rate must not exceed manufacturer s ratings.
Maximum LithiumPolymer cell voltage must not exceed 4.2V per
cell..
Charging must not be unattended. One person may monitor many
charging packs within close proximity.


Additionally ... Australian rules have a 162.5gram per cell weight limit
so for eg 6S is 950gram maximum

I note that Revolectrix are 1100grams for 6S70C5500mAH.

http://www.store.revolectrix.com/Featured/Revolectrix-5500mAh-6SHV-22-8V-Lipo-70C-SILHV-label

But for the thousands of people in Au who dont race under AMPBA rules .. all good

regs
W

[785boats]

Yep. That addendum to the rule was pointed out to me after that post. So they are fine at 4.2V. Which is all I ever did on the couple of occasions that I used them.
The 6s packs are actually 850g on the top line of the description next to the physical dimensions. I think you are reading the Shipping weight. Mine weigh 872g with connectors added. So weight is not a problem with any of the packs.

Paul.

[drwayne]

Yep. That addendum to the rule was pointed out to me after that post. So they are fine at 4.2V. Which is all I ever did on the couple of occasions that I used them.
The 6s packs are actually 850g on the top line of the description next to the physical dimensions. I think you are reading the Shipping weight. Mine weigh 872g with connectors added. So weight is not a problem with any of the packs.

Paul.

Excellent, a quality competitive LiPo for the racer market.
There were too few decent packs out here. :)

[madmikepags]

I typically charge everything at 10 amps, then on race day ill charge between 15-20 amps if i need to recharge something. I have batteries that are close to 5 years old with hundreds of cycles and most packs still are under 2milliohm per cell IR and balance out perfectly, especially my hyperion 5000's and 6500's

[Peter A]

Ordered another pair yesterday. That replaces all my 2s turnigys that have crapped out, well to be fair they have had a hard 2-3 years!

Two more here today. Racing on Saturday. Woohoo! Actually get to race some all fe races, okay so only three entries but all 4s boats, P-monos, my Pursuit against an Impulse and a Smashshark. Fun fun fun!

[Gary]

My 6s packs will be here by Friday and Sunday I will test. I know exactly what the boat does so this will be interesting to find out if they perform like they have been talked about. Will let you guys know Sunday night hopefully.

[Brushless55]

Keep us posted bro!