Let me ask you, what is the difference between the two?
Do not go for the obvious like size and color, both batteries are the same width and height but the white one is less than half the length.and about half the weight as well.
They are also both the same voltage, but the brown is 14v 3000Mah
the white one is 14v 4000Mah.
In case you didn't know these are lithium Ion batteries.
They charge to the same voltages and discharge to the same voltages, they can be used with the same chargers as lithium polymer batteries but as you can see are much smaller and more durable.
This is because they are similar to AA batteries, they have a metal casing.
This means any crashes are less likely to kill your battery.
So I will be building these packs to sell on for you guys.
You can build them yourself if you like just have a google for some sources to buy the cells from.
I am planning to sell 4500Mah 4s size wise they are a tad smaller than a 2200Mah 3s Lipo and a bit lighter.
I am aiming to sell them for about £8-£12, a equivalent lipo
(cheapest on hobbyking was £21.50)
And 4s 1000Mah
This is about half the size of the white pack above.
The reason i wont be selling the white pack 4000Mh 4s is due to supply issues but i may in the future.
but in the future i want to expand
3s 45000Mah
3s 4000Mah
and custom batteries will also be on the agenda.
If you are interested in these packs, have a look on blog history, another member of DIYdrones has posted about them previously,
and if you would like to buy a pack now, i will start selling the 4500Mah packs in about 3 weeks after further testing and built technique experimenting.
Just PM me.
Comments
ok well i have done more testing and the current capabilities are correct, these are less capable than li-pos
to achieve the same performance of lipos you require multiple packs in parallel however i have a fairly simple solution to this but it would be optional, a normal setup like the white ones above will also be an option.
I will be fitting each pack with their own balance leads, so if you have 4s 2p it will have 1 balance lead but if you have 4p it will have 2 balance leads.
You would charge these with a balance charger, for a lipo this would be an slow method but for Li-ion balance chargers would be best suited as they wont exceed the charging maximum.
The brown one is a battery, the white one is a different type of battery
yes i agree with you as to multiple packs, this is more of a in theory thing though :).
Sure you can put more cell in parallel to sum their power potential, but 10P is not an advisable solution - especially without PTCs protecting each cell.
C rating of a single cell wont change whatever the configuration, but i am not talking about a single cell, i am talking about a whole pack.
Teh more batteries in parallel the higher the current capability.
My Skywalker is happy using 2x5000mAh 3S batteries. It uses 45A at 100% throttle and 10A at cruise. If I use 15,000mAh of Li-ion batteries, that would be 3C at max power and under 1C in cruise.
This would net me 50% more flight time at 25% less weight. I should get well over an hour plus ample reserves.
How's my math so far?
My question is, once the batteries are 80% depleted, will I still have enough current output for a missed approach? I'd like to see a graph of C rating vs % depletion.
Panasonic NCR18650PF is 2900mAh and available in unprotected form. It is rated at 3.5lt continuous, but can provide up to 16A continuous (gets warm, needs cooling).
LG's 18650 HE2 is 2500mAh are rated at 14lt, but I haven't played with them yet.
But Jared is not working with NCRs and those aren't 18650s pictured wrapped up above, so I am just adding this for those still unsure of the NCR18650 and it's performance limitations.
There are 3 things that matter with batteries like this - Power Density, Energy Density and Cycle Ability. Power Density is the Achilles Heel of lithium ion technology at the moment, and those lithium ion cells that can deliver serious current (like the LG HE2) are only fractionally more energy dense than a comparable capacity (and much more power dense) lipo.
well as i say ill test them and get back to you guys.
I bet you're not going to mention the type of battery Jared =P, although that would clear up a lot of confusion here. I personally was going to test a huge array of the NCR18650Bs. But as Trent showed, its about 2c per cell. To get enough for a larger mutli-rotor, you'll need anywhere from 4-8P just to get enough AMPs beyond hovering. We're talking 24 cells (4S6P) just to get around 36A for a larger Hexa.
But hey, power to you if you figured out a better method.
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