R/C Tech Forums - SMC LIPO BATTERY THREAD

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Any news on the smc speedo?

Quote:

Originally Posted by fredygump (Post 13232176)

So I just got my SMC 7200 2S batteries...I went to solder on my usual "banana" connectors, but promptly found that the wire insulation is too big to fit through the plastic "polarity protector" case thing. I tried to force it by a few different methods...nothing seems to work.

These are the type of connector: http://www.amazon.com/Redcat-Racing-.../dp/B00D25G2HA

It goes like this--to attach these, you slide the plastic cover over the wire, solder the bullet, and pop the plastic cover over the bullet. But if you can't slide the plastic over the wire in the first place, there is no way to get it on the bullets after soldering the bullets on.

So what do I do? Do I just switch everything over to Deans' connectors? I don't want to use bare bullets, plus I can't...I didn't order that version of the battery. I want to keep all my batteries "universal" so I can charge them all the same and put them in any vehicle, but the only batteries that are giving me this problem are the 6 new SMC batteries.

Is there a connector other than deans that would be good? This will be used on everything, SC, 1/8 truggy...

What would y'all do, other than start with the batteries with 4mm bullet sockets built in? (Them just look like a problem waiting to happen to me, but to each his own?

EC5 are an excellent connector. There made for the high current 4 cells have unlike the deans.

4S actually has less current than 2S. Deans do just fine in either application.

Quote:

Originally Posted by Hoese37 (Post 13235110)

4S actually has less current than 2S. Deans do just fine in either application.

Looks like the 4S would have more current since the amp draw would be higher. To me current is like water in a hose and volts is the pressure in the hose. The amp draw a 4S Truggy motor has is a lot more than what a 2WD buggy would have on 2S.
But, to answer the question Deans will be fine.

Quote:

Originally Posted by OfnaJoe (Post 13235375)

That scenario yes, but a 4WD SC on 2S is much greater current draw than a buggy on 4S, likely even a Truggy.

That's true, heavy truck with small power. Just Like my F150 SuperCrew 4X4 with a 5.4 Triton V8 gets as good as or better than a friends Supercab V6

Quote:

Originally Posted by Hoese37 (Post 13235384)

That scenario yes, but a 4WD SC on 2S is much greater current draw than a buggy on 4S, likely even a Truggy.

Hold up y'all... Before you get too confident in your answers, let me ask you... If my truggy at 4S 7200 mah has the same run time as my SC at 2S 5000 mah, which one is using more electricity? Anyone?

The SC battery has 37 watts of energy
The truggy has 106.5 watts of energy.

If both run out in the same amount of time, which one was drawing more current?

It's all about amp draw, if you voltage is high and amperage is low then you can use a much smaller connector. If your voltage is low but your current is really high, you'll need a bigger connector. Wattage and voltage aren't the ones that really determine what connector you should use.

Think about how big your charging cables are and how small the wires are that power your power supply. More power is going to your power supply than what's going to your battery, so doesn't it seem backwards?

Does anyone have a dead saddle that they want to get rid of, or have any experience disassembling an SMC saddle? I just ordered a couple of saddle sets and need to dis-and re-assemble at least on set. If at all possible I'd like to practice on a dead one first. Thanks

I have an SMC 6500mah 4cell that my charger can
Only charge at max 3.3 amps way below 1c. Will this harm the battery and why!

Thanks for your knowledge on this matter. :sweat:

Quote:

Originally Posted by lala4fire (Post 13237296)

I have an SMC 6500mah 4cell that my charger can
Only charge at max 3.3 amps way below 1c. Will this harm the battery and why!

Thanks for your knowledge on this matter. :sweat:

No but the battery may run slower (no punch) and it will take longer to reach full charge

Saddle Pack balance question: I use a nice little LRP charger and while somewhat slow it does a good job balancing. The other day, I borrowed two packs and one of the two was very badly out of balance and the other was fine. Then, Saturday, I charged my personal pack on someone else's charger and just for kicks I put it on my charger to check balance and it was a bit out of whack but seems normal now. What's going on? I've never seen a pack come out of balance at all when only using my stuff on my charger. I'm using a cutoff voltage of 3.4 on my cars.

The chargers most likely have different calibrations.

Quote:

Originally Posted by gticlay (Post 13238569)

Make sure you check the charge leads regularly, I've had some corrosion build up over time under the heat shrink on the connectors and can give funny readings and inaccurate charges.

Justin