Battery Mod Info

[Mark Boarman]

I am now of the firm belief at this point is that the DJI and Multistar batteries aren't good aux battery candidates because of their low C ratings, unfortunately. My testing has born that out as well.

I'm a little confused as well, wouldn't the DJI battery have the exact same C rating?

 

[Adelberg aerial imaging]

Dji batteries yield 5700 mah @ what 670 grams with the casing

 

[Adelberg aerial imaging]

Multistar is a 5200 mah at 643g so it basically around the same c or a bit higher. Oh well keep trying next is the 280 at about 370g each which will yield 5600 mah as close to 5700 and tge t48 as we can get. They will weigh 740+ wiring so we shall see.

 

[damoncooper]

Damon I guess I'm a bit confused I thought we were looking for low C batteries because you got more power per wait out of the low c .I thought the general consensus was the DJI 47 and 48 batteries had very low c?

Low C batteries are much lighter, which is their allure. But with the DJI TB4X batteries as the main battery, low C batteries as aux batteries just don't get used properly and drain at the same rate, even other DJI TB4X batteries (ie identical). I suspect it's due to the charging logic in the TB4X but I don't know for sure. I do know the higher C (20C+) work as expected and drain in parallel with the main TB4X battery.

 

[Adelberg aerial imaging]

Ok so what c rating are we shooting for in the 2800 mah units. I unless I cancel them very soon they will leave China.

 

[damoncooper]

Ok so what c rating are we shooting for in the 2800 mah units. I unless I cancel them very soon they will leave China.

My 2650 Turnigy's were 20C and they drained properly. So at least 20C I would say, but going higher won't buy you anything but weight I think.

 

[damoncooper]

I think we're zeroing in on the sweet spot. Seems the sweet spot might be 20C, paired with a TB48 main battery, and either

• 2 X 6S 2800mAH (or as high as you can find/afford) in the 370g neighborhood, or
• 1 X 6S 5600mAH (or as high as you can find/afford) in the 740g neighborhood

Depending on your mounting preference.

 

[Adelberg aerial imaging]

These are 30c

Description:

Product type: Rechargeable lithium polymer battery
Battery parameter: Lion Power 22.2V 2800Mah 30C
Battery capacity: 2800MAh
Continous discharge rate: 30C
Battery size: 11.7 * 3.7 * 4.3cm / 4.6 * 1.4 * 1.7in
Battery weight: 379g / 13.4oz

 

[damoncooper]

These are 30c

Description:

Product type: Rechargeable lithium polymer battery
Battery parameter: Lion Power 22.2V 2800Mah 30C
Battery capacity: 2800MAh
Continous discharge rate: 30C
Battery size: 11.7 * 3.7 * 4.3cm / 4.6 * 1.4 * 1.7in
Battery weight: 379g / 13.4oz

Looks promising! Test and post! Are those the eBay ones?

 

[Adelberg aerial imaging]

They are in Ebay. But the c rating is 30 not 20 which in theory means they are not as efficiently built as the t4x mains.

 

[damoncooper]

If money is no object, these Thunder Power would be the ones I'd try next:

Thunder Power RC TP2700-6SP+25

2700mAH and 351g

 

[Adelberg aerial imaging]

A bit too pricy for me! I ordered two of the other ones for 75.00 but thanks for sharing! If I don't get success from these next pairs I will build my own pack.

 

[damoncooper]

A bit too pricy for me! I ordered two of the other ones for 75.00 but thanks for sharing! If I don't get success from these next pairs I will build my own pack.

Cool. Post back when you get them and have a chance to fly them.

 

[tcchow]

tcchow - I'm very impressed by your lipo brackets you fabricated for this mod. Are you in the US? Would you be interested in manufacturing/selling any additional brackets for those of us with limited skills and resources? lol

sorry for late reply. here are the link
#淘⼝令#长按复制这条信息，打开手机淘宝即可看到【聚龙模型 DJI大疆 Inspire悟1手持放飞器 脚架加强配件 云台保护 】http://b.mashort.cn/h.THi1h?sm=76f9a0

 

[Adelberg aerial imaging]

I never tried this but what was your baseline for a t48 battery in hover alone?

 

[Mark Boarman]

sorry for late reply. here are the link
#淘⼝令#长按复制这条信息，打开手机淘宝即可看到【聚龙模型 DJI大疆 Inspire悟1手持放飞器 脚架加强配件 云台保护 】http://b.mashort.cn/h.THi1h?sm=76f9a0

Thank you! Do you happen to have a link to the bracket that you have mounted to the lower body as well?

 

[tcchow]

Thank you! Do you happen to have a link to the bracket that you have mounted to the lower body as well?

sent me your email, I give you the Auto CAD file. Actually I am still modifying the arm brackets. the under pice are taken off

 

[damoncooper]

sent me your email, I give you the Auto CAD file. Actually I am still modifying the arm brackets. the under pice are taken off

Seems like a lots of gear, weight and hassle to hold two batteries.

Why not just use 3M Dual Lock like I am doing at the front of the battery compartment? Safe, cheap and weighs nothing.

 

[tcchow]

Seems like a lots of gear, weight and hassle to hold two batteries.

Why not just use 3M Dual Lock like I am doing at the front of the battery compartment? Safe, cheap and weighs nothing.

what I am trying to do are balancing left and right, front and back. That piece of alloy give me enough rooms to put the battery go little bit forward and backward and get to the balance I need.

 

[damoncooper]

what I am trying to do are balancing left and right, front and back. That piece of alloy give me enough rooms to put the battery go little bit forward and backward and get to the balance I need.

How much do all the pieces and screws weigh per side?