Bigger battery or parallel setup? (Full Version)

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jester_s1 -> Bigger battery or parallel setup? (4/15/2008 3:41:09 AM)

I''m only getting 3 flights out of my 600 Mah battery per day before the voltwatch (verified by a good meter) says it''s time to stop, which doesn''t quite cut it. Would I come out better to get another 600 Mah battery and run them together in parallel or just retire the one I have and get a 1200 Mah or more? I like the idea of redundancy in my system but am curious how different the flight times would be. I am also going to have a friend cycle my battery to make sure it''s good.

Paul



SavageX78 -> RE: Bigger battery or parallel setup? (4/15/2008 4:34:21 AM)

If youcan get a higher capacity pack.600mah isnt much these days. And rather than double the weight you could get 1 that has a higher MAh and keep the same weight. And there notthat expensive.



jester_s1 -> RE: Bigger battery or parallel setup? (4/15/2008 2:43:36 PM)

I can get whatever I need and I know the cost is negligable. But I do like the idea of a redundant setup so if I can get the same amount of time out of two 600 batteries as I can out of 1 1200, then I''m inclined to go that route even though it does addd a few more ounces of weight to my plane.



SavageX78 -> RE: Bigger battery or parallel setup? (4/15/2008 4:35:37 PM)

quote:

ORIGINAL: jester_s1

I can get whatever I need and I know the cost is negligable. But I do like the idea of a redundant setup so if I can get the same amount of time out of two 600 batteries as I can out of 1 1200, then I''''m inclined to go that route even though it does addd a few more ounces of weight to my plane.


Well if your not worried about the weight then I see no reason it cant be done. But I dont think its good to run an older pack with a newer pack. I know thats true if your running in series. But im not sure if when running in parallel it matters if there both new or not. I would think it would be ok.

And you should get about th same amout of runtime with 2 600s as you would with a 1200. But that may be affected by your current battery. Once your buddy cycles it you''ll know for sure.



richrd -> RE: Bigger battery or parallel setup? (4/15/2008 5:31:24 PM)

Interesting thought about redundancy but without extra circuitry a short will still pull down the parallel pack. But still better than just one pack then again battery packs IMHO are the most reliable part of a plane if will maintained. The down side is now two packs to charge separate you can not charge Nixx in parallel & weight just doubled. So I always end up with a higher capacity pack. BTW I use Sanyo HRU 1650 thur 2700 MiMH myself. Go check them out
http://www.radicalrc.com/shop/?shop=1&cart=1633429&cat=19&
Rich



RJConnet -> RE: Bigger battery or parallel setup? (4/15/2008 6:47:34 PM)

One other advantage with the parallel packs is that the internal resistance/impedance is halved so the voltage seen by the servos under heavy load stays a little higher.........RJ



jester_s1 -> RE: Bigger battery or parallel setup? (4/15/2008 11:43:47 PM)

My plane isn''t that demanding on the batteries to need more current draw capacity. If there isn''t much worry about the batteries going bad, then I''ll just get a higher capacity pack. Thanks for the help.



rlmcnii -> RE: Bigger battery or parallel setup? (4/16/2008 12:27:20 AM)

jester s1,

Take a look at this page. The 2/3A 1500 is a nice, light pack with good capacity. This place makes a very nice product. If you want to learn a lot about NiMH and NiCd cells read his FAQ''s. It will be time well spent.

http://www.hangtimes.com/sportrxpacks.html



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