Advice on Li-Po

[Berto]

Hi and sorry for the long post.

I've been researching Lipos and I’m starting to get a handle on them but wanted to check my info before I jump in.

So if I have an example S2 3300mAh 30C.

That means it has 2 cells in series (S).
Capacity (C)= 3.3Amps or 3300mAh.
Voltage (V) = 7.4Volts.
Max load (30x3.3) 99 amps.
Storage should be at around 50% capacity which is 1.65amps.
You shouldn’t drop below 80% capacity, 0.66amps, before stopping use.
Charge rate should be 3.3amps and discharge would be 1.65amps.

The Max current of the battery should exceed the draw of the ESC you are using.

More capacity means more run time but also can mean bigger batteries.

I need a Lipo bag or ammo box to store and charge them in.

Is that correct and have I missed anything?

Can anyone recommend a suitable charger?

For an ESC of 60A (continuous running a 4250kV motor, is 3300map 2s 30C suitable?

And finally I’m from
The Uk and was wondering where does everyone buy online? I’ve found a few (modelsport, wheelspin) but would love people’s recommendations of places to buy more batteries and accessories.

Thanks to TNTproof for giving me a point in the right direction.

 

[BobP]

Here is a good starter charger if your budget is tight but I would get a better one if you can. this what I started with but it didn't fit my needs for very long and I had to get another one or 4
https://www.amainhobbies.com/venom-power-pro-duo-ac-dc-battery-charger-6s-7a-80w-vnr0685/p468689

https://www.amainhobbies.com/protek...v-lipo-ac-dc-battery-charger-ptk-8517/p488513
I got 2 of these and they work ok but are slow on large cap bateries

This will get you going and you will never have to wait
https://www.amainhobbies.com/junsi-...ery-charger-10s-40a-2000w-jun-4010duo/p256250

 

[tntpoof]

Berto most of your post is correct but we use other terms Not so much percentage but actual voltages... and you can discharge your battery at 10 amps..and volts per cell for storage is 3.75 volts...a lipo bag is good but you can also use a bucket of sand ...I looked tat the sites you mentioned they seem ok..prices are fair....Id pick a charger that will be of some more use to you. I like a charger that will charge a single cell because some lipos have a weak cell that might need to be brought up a few 1/10 or so...and theres NO R in my screenname Tntpoof..no r, I'm not a pirate...lol..also the 7.4 volts is not exactly correct its 8.4 volts with a full charge...

 

[Berto]

thanks for the corrections, glad I asked as I wasn’t quite sure myself.
I thought charging at 10 amps would shorten the life of the battery? I’m sure I’d read that you can charge at higher amps but it can effect the amount of charging cycles
Is this a suitable charger:https://www.modelsport.co.uk/overla...c-lipo-balance-charger/rc-car-products/408440
Or this one:
https://hobbyking.com/en_us/imax-b6-ac-charger-discharger-1-6-cells-genuine-with-uk-plug.html
Sorry tntpoof,

 

[olds97_lss]

Typically you charge at 1C unless your in a hurry. Just because a charger is capable of charging at 10A doesn't mean you have to set it up to do so. Most Lipo chargers have a screen and you can adjust the output to suit your needs.

1C = MAH/1000

So, to charge a 2300mah pack at 1C, you would charge it at 2.3 amps.

Some lipos are fine with charging at a higher rate than 1C, but typically, 1C is what they are all capable of. Also, charging at more than 1C is likely to shorten it's life some, even if it is capable of doing so. Mine are all capable of 2S, so I tend to not care and charge them at whatever my charger allows.

Watts also comes into play as well. Chargers are typically limited to watts and amp output. One of my chargers does 4 x 10A and 4 x 100W. With that, I can safely charge a 10000mah 2S pack at 1C, which requires 10A and 74W. Whereas I can only charge a 9000mah 3S pack at 1C as it's throttled by watts. Voltage x Amperage = watts, (3*3.7V)*9A=99.9W.