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Posts Tagged ‘battery’

Review: Align 850mAh Lipo 30C Battery (HBP85001T)

October 8th, 2009 No comments

Align 850mAh 30c Trex250 Lipo (HBP85001T)I was looking for a couple more Trex 250 batteries but unable to source any Outrage 860mAh 30c (which are great). I decided to give the Align 850mAh 30C a chance, given they were just so dam cheap (lets face it, the cells are probably sourced from the same factory).

On initial inspection when compared to the the Outrage equivalent the balancing tap and JST power connector are on opposite sides. The power cable whilst perfectly fine is not insulated with the nice supple silicon that the Outrage battery is, which makes it slightly stiffer, not a big issue really. The Align battery is 1 gram heavier (when I weigh it) than the Outrage, so the COG setup is essentially the same, which made life easy for me.

Flight testing proved the Align battery to be equally as good as the Outrage with identical flight times of about 4 minutes hard 3D (I could squeeze a bit more but I tend towards the safer side). The only thing that remains to be tested is the life span of the battery in terms of the number of cycles.

Overall the battery is value for money, I tentatively give an 8 out of 10 based on the fact I have no idea how many usable cycles it will get.

Rating: 8/10

Thunder Power – Pro Power 45C at IRCHA

August 15th, 2009 No comments
  • 45C Constant discharge
  • 6C Charging
  • 200-250 Cycles
  • 1 Year 50% crash replacement policy
  • 1 warrenty
  • 25% drop in price

Some amazing features there but still too expensive in my opinion, unless the price of these batteries start to drop substantially, for most of us the cost is too prohibitive to get a practical setup. At least the price is moving in the right direction :)

Thunder Power - Pro 45C

Thunder Power released the Pro Power 30C lipo battery almost a year ago. They had the latest cell, Pro Power 40C, slated for release this past couple months. However after further consideration Thunder Power decided why do 40C when they could achieve 45C! Shown at IRCHA this week for the first time ever, and seen right here first!

Now these aren’t just prototype samples for show at IRCHA, these batteries are not only shipping but for sale today from Thunder Power dealers at IRCHA. Today the Pro Power 45C 6S 2650mah (500 heli), Pro Power 45C 3S 2250mah (450 heli), and Pro Power 45C 3S 850mah (250 heli) are available to take home. The rest of the lineup you see in the pictures here will be available sometime between September and October.

With the Pro Power 45C release Thunder Power RC decided it was long overdue to give the labels a fresh new look.

6C Charging! Yes you can safely charge these packs at 6C rate if you choose. With older technology cells charging at such a high rate would quickly shorten the lifespan of the battery. This is not the case with the new G4 cell formula in the Pro Power 45C packs. Thunder Power RC has done extensive testing and shown 6C charging over 200-250 cycles with zero loss in performance and only a nominal loss in battery capacity (i.e. run time).

New cell technology, and a price drop! Yes that was not a typo, Thunder Power RC is going to price the new Pro 45C packs 10% below the current Pro 30C pricing. Then beginning in September the Pro Lite V2, Pro RX, and Pro Power 30C will all receive a 25% price cut! This will make every line of Thunder Power’s lipo batteries more competitive in pricing with other brands on the market.

Thunder Power RC for the past 6 years has instituted a 50% crash replacement policy and warranty against defects good for 6 months from day of purchase. Starting this September the 50% crash policy and warranty is now extended to one full year from purchase! Thunder Power RC is very confident in the quality of their products and are happy to extend their customer service. Also beginning in September, owners of Flight Power packs can qualify for the 50% crash replacement program as well!

www.rcheliresource.com

Rhino 6S 4900mAh 20C Crash Durability

August 10th, 2009 No comments

10 points for crash durability, this pack took the full brunt of the crash when my Trex600 went in, and it’s still rocks.

See: http://heli.brixtonjunkies.com/2009/06/12/rhino-zippy-4900mah-6s-lipo-review/

Crashed Rhino 6s 4900mAh

Transmitter Lipo (3s 11.1v) Stepdown

July 2nd, 2009 4 comments

Rectifer Diode - 1N5404
The convenience of a lipo battery in your transmitter speaks for itself. The problem is many modern transmitters aren’t designed to take the higher voltage that lipos supply. Most transmitters are designed for use with NiCad or NiMh batterys which are 1.45v per cell fully charged, where as lipo batteries are 4.2v per cell fully charged. Stock NiMh TX batteries are 8 cell which equates to 11.6v fully charged by comparison aftermarker TX Lipo batteries are 3 cell which is 12.6v fully charged, that’s a 1.6v difference. Also lipos have a tendency to sit at relatively high voltage for longer unlike NiMh batteries which drop from peak voltage very quickly.

Currently there are plenty of people are using 3 cell TX lipos in there DX7’s and DSX9’s and have had no problems and maybe they never will? I’m guilty of doing this with my DX7 for months now with no problems to date. It’s no secret that the internal circuits of most transmitters is around 3v, which means the TX is using a voltage regulator to stepdown the voltage. Hence the higher the input voltage (from the battery) the more stress you are putting on the TX voltage regulator. So maybe your TX wont go pop immediately but the lifespan of the voltage regulator is probably shortened, either way it doesn’t fill you with confidence.

No one wants to open up their TX’s and mess about with unsoldering and re-soldering PCB components and in the process invalidate the warranty and/or destroy a perfectly functional transmitter. So how about stepping down the lipo battery voltage before it enters the TX…sounds good to me.

The Modification

Diodes have a property call a forward voltage drop, in normal use it’s a side effect rather than something that is specifically capitalized on, however that’s exactly what I’m going to do. By using two 1N5404 rectifier diodes in series (see photo above) on the positive side of the TX battery cable you will effectively have approximately (2 x 0.75v) = 1.5v stepdown. This will bring your lipo down from 12.6 to 11.1 which is a nice healthy voltage for your transmitter and close to what it would expect from a NiMh battery. The 1N5404 is a rectifier diode and designed for power supply/rectification application and is rated for 3A hence it should be fine in this application as the TX is only drawing approximately 300mA (this varies from TX to TX, normally it’s stated in the manual).

TX Stepdown Mod

One thing to note is the diode stepdown can not be part of your charging circuit otherwise your lipo charger will complain about the voltage or in the worst case you might have a “little” fire on your hands :( The battery I used was a Outrage XPTX 11.1v 2500mAh (see photo) which has a TX plug, a standard rc connector and a balancer plug (Thunder Power) all pre-wired which turns out to be very handy.

Below you can see the redundant rc connector which is used to charge the lipo hence isolating the stepdown.

TX Stepdown Mod Installed

I urge anyone who is considering attempting this to do there own research in order to better understand what they are getting into. Here are a couple of links that may help:

http://www.kpsec.freeuk.com/components/diode.htm

http://www.fairchildsemi.com/ds/1N/1N5406.pdf

Summary

Don’t know yet too early to tell…seems fine so far 😛

Review: Rhino (Zippy) 4900mah 6S Lipo Review

June 12th, 2009 5 comments

Rhino 4900mAh 6S 22.2v 20C Lipoly PackI just brought 3 based on the fact they are so dam cheap (the cost of 1 well known brand). They also weigh exactly the same as a TP5000 6S V2 (+- 2grams). If that’s your current battery then COG wont change. They come pre-installed with deans connectors which is a nice touch. The balancer connector is an “Align Balancer Connector”, so it’s easy enough to connect any type of balancer with the right adapter.

When I first ordered them I was a little concerned that the 20C rating might be a little low for hard 3D but after the first flight test that doesn’t seems to be the case at all. They were barely warm and they have some serious power, as much as I’ve ever felt with other well know brands. I don’t have any hard data to support that but my Trex600 “feels” like it has a tonne of power, and that’s good enough for me.

Perhaps they are rated for 20C in order to get a higher level of safety or performance?

I would urge others with a Trex600 or similar to think about trying these batteries, they are serious value for money. These batteries are going to force the rc battery industry to reevaluate current pricing models, which is long over due IMHO.

The only question now is how many cycles will I get with these batteries?

Rating 9/10

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