Lipo Question/help

[hkusp45]

I appreciate the help

I did and always balance my cells with a hyperion LBA10 while I charge them.
I changed the voltage cutoff to 13.2 for a 4 cell set up
I use the ICE charger and has been good so far I have a hyperion charger on the way as well so I can charge the big 6 cell pack

I am hoping a change to parallel will save the life of my batteries and my DPR (thanks SJFE) just got here so now I will know whats going on in the boat.


thanks

That is all very good equipment!! I was not knocking anything just tryin to solve the problem......

Please let us know if you get it sorted

[Diegoboy]

I believe SJFE is correct. The "C" rating will be additive.

[Diegoboy]

RC Hobbies .org

RCUniverse

[JimClark]

Not trur there are a lot of Thunder Power cells and also PolyRC cells being used in racing

It seems the guys who race use the Neu power cells.

[NorthernBoater]

The c is not additive:
- 3s1p with a rating of 2400 mah and 10c will deliver 28.8 amps continuously.
- Those same packs in a 3s2p will have a total capacity of 4800 mah and will be able to deliver 57.6 amps continuously.
- If the c was additive then that 3s2p pack would be able to deliver 115.4 amps. Half of the current is 57.6 amps which is more than one pack can deliver. You will end up with blown cells if you do this.

[SJFE]

Not trur there are a lot of Thunder Power cells and also PolyRC cells being used in racing

I ment to say "seem to use". I type faster than I think some of the time.

Wait a minute....I did say seem to use..it's not like I said..Oh they ALL use them bar none. jeez

[Diegoboy]

The c is not additive:
- 3s1p with a rating of 2400 mah and 10c will deliver 28.8 amps continuously.
- Those same packs in a 3s2p will have a total capacity of 4800 mah and will be able to deliver 57.6 amps continuously.
- If the c was additive then that 3s2p pack would be able to deliver 115.4 amps. Half of the current is 57.6 amps which is more than one pack can deliver. You will end up with blown cells if you do this.

Unless I'm reading all this wrong, You are incorrect sir.

RC Groups...

...but what do I know? I'm just googling it and posting the results I read. It's just funny that all the results I have read are contradicting the general consensus. Can you show me proof of your theory? I'd like to see it.

Just to be sure, is the "C" equal to mAh? I might be wrong if that is not true.

[Flying Scotsman]

The c is not additive:
- 3s1p with a rating of 2400 mah and 10c will deliver 28.8 amps continuously.
- Those same packs in a 3s2p will have a total capacity of 4800 mah and will be able to deliver 57.6 amps continuously.
- If the c was additive then that 3s2p pack would be able to deliver 115.4 amps. Half of the current is 57.6 amps which is more than one pack can deliver. You will end up with blown cells if you do this.

3s1P 2400 mah 10C will deliver 24 amps @ 20C will deliver 48 amps 2p will deliver 96 amps @ 20C, all continuous figures
2S1P 5000 mah 25C will deliver 125 amps continuous and 7.4V
2S2p 5000 mah 25c will deliver 250 amps continuous
2 2S1P 5000 MAH in series will deliver 125 amps and 14.8V

Doug

[Diegoboy]

3s1P 2400 mah 10C will deliver 24 amps @ 20C will deliver 48 amps 2p will deliver 96 amps @ 20C, all continuous figures
2S1P 5000 mah 25C will deliver 125 amps continuous and 7.4V
2S2p 5000 mah 25c will deliver 250 amps continuous
2 2S1P 5000 MAH in series will deliver 125 amps and 14.8V

Doug

Doug,
Layman's terms please, SJFE is right? or not?

[wickedgmc]

That is all very good equipment!! I was not knocking anything just tryin to solve the problem......

Please let us know if you get it sorted

did not taking anything negative, sometimes the answer is right in front of you and someone has to ask you the question for you to find the answer.

[NorthernBoater]

When you parallel you double your capacity not your c rating. There is no way to double your c rating!

[Flying Scotsman]

Doug,
Laymens terms please, SJFE is right? or not?

OK

C refers to the discharge rate eg a 1000mah 10c battery is rated at 10 amps. 1000mah 20c is rated at 20 amps all lipo batteries are rated to deliver a short 10 seconds or so higher amp rate typically 30C on a 20C continuous rated battery
Therefore multiply your MAH figure By the C rate eg 1000mah 20C ....2.0 X10 = 20 amps.
When you parallel 2 2S1P 1000 mah 20C batteries = 40 amps @ 7.4V
In series 2 2s1P 1000mah 20C batteries = 20 amps @ 14.8V

I trust this makes sense.

Doug

[Diegoboy]

More googling found this...

"For example, two 1,000 mAh Lithium Polymer cells with 15C continuous discharge ratings that were wired in parallel would create one 3.7 V pack with a 2,000 mAh capacity and could support an application where the total current draw was up to 30C (30 Amps). "

Link <-- Pulled directly from a lipo battery website!!

Again, it contradicts. Please show your sources for your info.

[Diegoboy]

I think that was the KO punch to this debate...


LOL

[SJFE]

Well I can't argue with that data. Screw it I'm ordeing them. I'll take one for the team here.