Thanks to your contributions on this forum, I finally opted to purchase batteries with very high amperage to get what I wanted, a very long battery life. Yeahhhh what a good investment!!! Now the workers have worked in my garden with a mini excavator for digging and preparing the construction of a garden shed and terraces, I played almost 2 hours this afternoon crawling and bashing into the holes on the gravel in the mountains of debris with a ... 7600mAh Traxxas (I won at least 10 minutes yesterday at low speed).
But of course, after receiving these batteries has raised the question of charging time and capacity of my current chargers to load the batteries @1C or 2C (SPC 8.2A coming soon, on the way from USA). I have two Maxxtrax AC 680 +, limited to 6A / 80W output. Until now I was using 4.4A NiMH and2S / 3S 5A Lipo batteries. So my current chargers were suitable for this purpose:
7,4V (2S) x 5A = 37W
11,1V (3S) x 5A = 55,5W
8,4V (NiMh) x 4,4A = 36,96W
Under the 80W maximum output capacity of my charger.
Now with the Traxxas 2S 7.4V 7600mAh:
7,4 (2s) x 7.6 = 56,24 (@ 1C charging) = still ok (is it possible to charge it @ 2C? ), but I'll not be abgle to charge it @ 1C because output is limited to 6A... 80W yes but 6A, wo with a 2S Lipo, I can't use the maximum W value, right?
And with the SPC 8.2A:
7,4 (2s) x 8.2 = 60,68W @1C but... 7,4 (2s) x [8.2x2 @ 2C charging] = 121,36W
If I am satisfied, certainly I'll buy a second pair (for my Savage, because @ 3Sthe Savage flux is just excessive and difficult to controlto be honest).
So my new batteries are more demanding. I put the question of whether I should invest in new chargers or not. Charging time for 7600mAh @ 6A would be extended by 50% compared to a charger capable of outputting @ 7.6 A. Consequence: 1:30 instead of one hour. As I charge both batteries in parallel, this is ultimately less embarrassing than if I had only one charger, but ... if I go hiking, I'll have to charge 2 or 3 pairs of batteries. This would mean a difference of 1 to 2 hours depending on battery capacity to load ..
So I plan to spend on a dual output charger with a capacity of 2 x 10A, 150W per output in the event that I would buy the batteries that power applicant (3S with high amperage rechargeable 2C)
After some research, I found that many different brands of chargers were built on the same basis ... same look, same specifications but different brands. I confess to being hesitant about this kind of product. Sold as expensive OEM with another brand only... Like for example SkyRC = Hitec Ultimate = ... I found 3 or 4 other brands with exactly the same products, but different color... and writings.
It seems that some manufacturers are really manufacturers, I mean the Source of some products (Ok they probably manufacture somewhere in Asia or India... but engineering is their property, they are not only a marketing company but an engineering company).
Here is a list of brand that seem to be serious because not content just to put their brand on an OEM product manufactured for 10 different other brands by a supplier in China also responsible for the design of the product.
(links are links to the manufacturer's homepages, not to resellers so I suppose that I'm ok with the rule 11? If not please remove the links and accept my apologies)
--- Hyperion: http://www.hyperion-eu.com/products/type/15
--- Graupner: http://shop.graupner.de/webuerp/serv...11&language=en
--- Ansmann: http://www3.ansmann.de/cms/en/chargi...e-charger.html
I already know Ansmann very well because all my AA, AAA, and 9V batteries are NiMh rechargeable batteries from Ansmann, the quality is very high, their ''maxx-e+'' technologie is very efficient (low power loss for NiMh, after a year there is 80% capacity left in a battery that has been charged but not used during a year http://www.ansmann.de/cms/fr/busines...u-battery.html ). I use 2800mAh AA batteries into my Canon 580EXII flash gin and the speed + the autonomy is impressive (I use 4 flash guns with pocket wizard control, and I need power and speed)
So I am convinced by the quality Ansmann for this type of product, but I'm also curious about the other two brands.
What do you think?
A - I have to change the charger and buy a single dual output charger with external power supply (powerful enough course)
B - I would rather invest my money in a pair of Lipo 8.2mAh or 9.2mAh and keep my current loaders, since I would have time to recharge my batteries back from my hikes
C - if I change charger, is it better to take out two single or one dual output? With 2x mono outputs chargers, I can reach the 150W on AC with no external PSU. Finally in terms of price, 2x mono output chargers AC + / - = 1x dual outpu charger + 1x DC power supply
Thanks for your feed back.