Search: Posts Made By: ramboman
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Forum: Power Systems
07-30-2017, 08:40 AM
Replies: 324
Views: 149,524
Posted By ramboman

There are other factors like : * life...

There are other factors like :
* life expectancy
* ease of use
* charge speed
* discharge capacity
* cost
* size
* form factor

For the same "6s" brushless, I may use :
07-01-2017, 07:53 AM
Replies: 23
Views: 3,665
Posted By ramboman

Cool This is a useless discussion between an expert in...

This is a useless discussion between an expert in theory (who does not read the specs) and some people having practice...
The only argument against a123 is weight... if you need weight to balance...
06-30-2017, 07:03 AM
Replies: 23
Views: 3,665
Posted By ramboman

Cool Who talked about a123 18650 ? We talk about the...

Who talked about a123 18650 ? We talk about the 26650... 2.5Ah.
And yes, we agree... for the same capacity a123 is heavier than LiPo and LiPo is heavier than Li-Ion...
Let's come back to real...
06-29-2017, 07:58 AM
Replies: 23
Views: 3,665
Posted By ramboman

Thank you for the lesson... If you are logic...

Thank you for the lesson...
If you are logic with yourself you should recommend li-ion !
06-29-2017, 07:38 AM
Replies: 23
Views: 3,665
Posted By ramboman

Cool Thank you Dennis Practice vs theory ;) ...

Thank you Dennis
Practice vs theory ;)
Don't forget the main switch :
http://shop.rc-electronic.com/SPS-Systems.htm?shop=k_emcotec_e&SessionId=&a=catalog&p=2263
06-28-2017, 06:34 PM
Replies: 23
Views: 3,665
Posted By ramboman

I fly with a123 batteries since the beginning in...

I fly with a123 batteries since the beginning in 2006... I am not sure you have the same experience... and I am note alone...

The only weak point is the increased weight... If you need weight...
06-28-2017, 08:19 AM
Replies: 23
Views: 3,665
Posted By ramboman

Cool @misterbill303

Using a123 is a good solution to balance a plane like the Camel.
Build your pack around your brushless... no add'l weight necessary.
7s2p a123 would be the right choice for the Camel... a Hacker...
06-28-2017, 05:59 AM
Replies: 23
Views: 3,665
Posted By ramboman

That's not true ! From my own experience : 1....

That's not true !
From my own experience :
1. weight radio is not twice, only 20% more
2. c-rate is bull I get regularly 50A from a cell... peak is 120A
3. no need to balance each time
4....
06-27-2017, 10:41 AM
Replies: 23
Views: 3,665
Posted By ramboman

I fly with a123 only since the beginning in...

I fly with a123 only since the beginning in 2006...
Present best source follows :
https://eu.nkon.nl/a123-systems-anr26650m1b-a-grade-3-3v-a-grade.html
11-21-2015, 11:35 AM
Replies: 10
Views: 2,151
Posted By ramboman

I bring my planes to the charger, to the back of...

I bring my planes to the charger, to the back of my car...
One at a time, charging at 4c between 2 flights...
11-21-2015, 09:33 AM
Replies: 10
Views: 2,151
Posted By ramboman

LiPo batteries need to be easily removed to be...

LiPo batteries need to be easily removed to be charged... a123 can be charged in place without risk... that's the difference
11-21-2015, 08:04 AM
Replies: 10
Views: 2,151
Posted By ramboman

a123 batteries don't need to be removable... they...

a123 batteries don't need to be removable... they can be used as weight to balance the plane... instead of lead...
10-11-2015, 02:11 PM
Replies: 42
Views: 4,989
Posted By ramboman

Cool Nice ! I'm not alone in this world ;)

Nice !
I'm not alone in this world ;)
10-11-2015, 07:32 AM
Replies: 42
Views: 4,989
Posted By ramboman

I use one a123 pack per plane, charged in place...

I use one a123 pack per plane, charged in place in less than 15 min.
10-10-2015, 04:38 PM
Replies: 42
Views: 4,989
Posted By ramboman

Two a123 is equivalent to five NiMh as far as...

Two a123 is equivalent to five NiMh as far as voltage is concerned.
No regulator is required.
10-10-2015, 05:30 AM
Replies: 42
Views: 4,989
Posted By ramboman

I did it 9 years ago ;)

I did it 9 years ago ;)
10-09-2015, 06:00 AM
Replies: 42
Views: 4,989
Posted By ramboman

Cool Look at the specs... its normal to have a drop to...

Look at the specs... its normal to have a drop to 2.7V at 40A per cell... recommended cut-off is 2.0V... 2.5V is very conservative.
10-08-2015, 09:32 AM
Replies: 42
Views: 4,989
Posted By ramboman

Under High Power

I run regularly my 6s2p to 12s2p packs :cool:at 80A to 90A... voltage drops to 2.7V per cell... cut-off at 2.5V... oldest are dated 2006 ;)
08-19-2015, 01:00 PM
Replies: 31
Views: 11,224
Posted By ramboman

Those are UPS batteries... designed to provide...

Those are UPS batteries... designed to provide high current for a short period... under 24V my iCharger draws up to 40A when charging 12s2p a123 at 20A...
:cool:
08-19-2015, 09:16 AM
Replies: 31
Views: 11,224
Posted By ramboman

I use two gel batteries designed for UPS since...

I use two gel batteries designed for UPS since four years, 65Ah, paied 104 each... an iCharger 3010b and a lot of a123 packs from 4s1p to 12s2p...
Satisfaction ;)
06-03-2015, 06:03 PM
Replies: 34
Views: 8,849
Posted By ramboman

I am using two 65Ah gel Pb strapped in the back...

I am using two 65Ah gel Pb strapped in the back of my car... 24V for my iCharger 3010B... enough to charge a 12s2p a123 six to seven times at 20A for 15min...
06-03-2015, 05:48 PM
Replies: 36
Views: 5,761
Posted By ramboman

You are right... I disconnect the batteries when...

You are right... I disconnect the batteries when not in use...

My safety procedures follow :
=> master switch
=> throttle cut on Tx
=> failsafe to 0% on Rx
=> never fingers in the...
06-03-2015, 04:01 PM
Replies: 36
Views: 5,761
Posted By ramboman

That's ideology, not science, there is a big...

That's ideology, not science, there is a big difference between chemistry of LiPo, LiIo, LiFe... they are not equivalent...

You may better compare the security of a123 to the security of the...
06-03-2015, 03:33 PM
Replies: 36
Views: 5,761
Posted By ramboman

Just look : ...

Just look :
https://www.youtube.com/watch?v=p21iZVFHEZk

We are talking about LiFePO4 chemistry...
06-03-2015, 03:07 PM
Replies: 33
Views: 38,619
Posted By ramboman

Right... typing error... :cool:

Right... typing error...
:cool:
06-03-2015, 03:05 PM
Replies: 36
Views: 5,761
Posted By ramboman

Cool Did you try ? The Nasa tried... I tried by...

Did you try ? The Nasa tried... I tried by accident... NO FIRE.
06-03-2015, 09:12 AM
Replies: 33
Views: 38,619
Posted By ramboman

Cool 10C 15C 20C Lipos - what does the C mean?

NOTHING... the idea is to tell you the maximum current you may get from your LiPo... more a marketing datum than real... if you have a 5.0 Ah pack rated 20C you shoud be able to get 20*5A=20A... just...
06-03-2015, 09:01 AM
Replies: 36
Views: 5,761
Posted By ramboman

Cool Use a123...

a123 fires are NOT a possibility. Forget about safety measures...

1. Do charge a123 unattended.
2. Forget about proof container when charging...
3. Charge your a123 in your plane...
4. Leave...
04-07-2015, 06:51 AM
Replies: 22
Views: 5,581
Posted By ramboman

Cool Stupid question... my B-25 got two old...

Stupid question... my B-25 got two old Plettenberg 370/40 with 12s a123 in a circular pack... I never found appropriate shrink tubes :(
04-05-2015, 07:31 AM
Replies: 22
Views: 5,581
Posted By ramboman

Cool I use a123 since 2006 with good results... at the...

I use a123 since 2006 with good results... at the beginning with SPT, now soldered... with a 200W Weller iron... very easy...
The cells last forever...
The only problem is to change de form...
Showing results 1 to 30 of 121
 


 
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