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05-27-2016 05:15 PM  3 years ago
Four Stroker

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Atlanta

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The standard way is to fly say 4 normal flights (or less) and measure how much you put back into the pack when charging. Add to that flying only down to 50%. Sometimes I get down to the last 40% for some reason.

Telemetry is different for brands. If you are stopping at 6.4 volts instantaneous low voltage, you would not get one flight. I get low voltages of 6.0 or less on every flight and I have 18 AWG on the battery and two connectors into the receiver.

So you could discharge your pack to 50% and go fly. The telemetry will give you the stop flying voltage - immediately. Of course, you need to cycle the battery (down to 6.0 volts) and find out the capacity. But 6.4 volts hovering seems to be about right for 40%~50% left. There is a lot in an A123 below 6.0 volts ! Maybe 300 mAh.

But I only average about 1.5 Amps flying. Your results may vary.
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05-27-2016 09:42 PM  3 years ago
ICUR1-2

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Ottawa, Ontario

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They do handle very differently however and you have to unlearn ingrained habits like trusting voltage readings to measure capacity. You must measure capacity via recharge and time your flights.
-Jeremy
The problem I had with 2 of them LIFE batteries was as they age they lose capacitance
I started out being able to fly 6 flights after they were about 5 months old they only gave 5 by luck I caught the low battery before flight.
If you use them charge often rather than risk it.
{I probably had lousy packs}

I switched back to regulated, lipo because they have a longer service life.
and are easier to monitor.

been using the same rx battery for about 3 years now
It is a 2s2p 5000 mah 20C discharge hard case rc/car pack
no signs of puffing yet
it has lost about 600 mah capacity since new though

I would not trust a 2s1p for a rx battery makes sure it is 2s2p
spending time, paying attention
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05-27-2016 10:07 PM  3 years ago
jharkin

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Holliston, MA - USA

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The problem I had with 2 of them LIFE batteries was as they age they lose capacitance
I started out being able to fly 6 flights after they were about 5 months old they only gave 5 by luck I caught the low battery before flight.
If they lost capacity in 5 months than you must have got some crappy China knockoff cells or something.

Try genuine A123 cells - they are good for thousands of cycles. Hangtimes Hobbies (NOBS), RadicalRC , Fromeco and other make packs with them.
-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks
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05-27-2016 10:45 PM  3 years ago
Four Stroker

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Atlanta

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Yeah. My oldest packs cycle to a few percent of like new. They are the old 2300 series which are maybe 3 years old. You can abuse them by deep discharging and overcharging on LiPo setting and charging at 4C at the field, etc.
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05-27-2016 11:00 PM  3 years ago
Ace Dude

rrProfessor

USA

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The problem I had with 2 of them LIFE batteries was as they age they lose capacitance
I started out being able to fly 6 flights after they were about 5 months old they only gave 5 by luck I caught the low battery before flight.
If you use them charge often rather than risk it.
{I probably had lousy packs}

I switched back to regulated, lipo because they have a longer service life.
and are easier to monitor.
All battery chemistries loose capacity as they age.

Genuine A123 are very robust, I'd put them up against any LiPo in terms of durability and cycle life.
  
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05-27-2016 11:07 PM  3 years ago
ICUR1-2

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Ottawa, Ontario

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When you say A123 you mean the AA type looking cells ?

I had the the ones that look like lipo's
spending time, paying attention
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05-31-2016 07:51 PM  3 years ago
Andy from Sandy

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Bedfordshire, UK

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The soft cell LiFe packs I have seen a few failures.

A123 cells are solid as you say like AA cells.

The larger size of A123 cell is almost as big as D size cells.

https://www.electricwingman.com/a12...2s-battery.aspx

See spec page.
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05-31-2016 08:38 PM  3 years ago
Four Stroker

rrElite Veteran

Atlanta

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http://www.a123systems.com/Collater...ata%20Sheet.pdf

These are the ones for a flight pack.
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