battery

[hharney]

My choice has been Concorde for the last 20 years. I have paid the extra for the platinum series and haven't been disappointed.

I change my battery every 3 years no questions asked. A lot of guys say if it starts it's good but that is not true. I am a serious flyer and routinely fly IFR, over lakes (big ones) and night so I have no problem with buying new and staying fresh. It's the one time you loose charging that will make a believer out of you.

I also use a Battery Minder made specifically for the Concorde battery. It stays on my plane whenever it's in the hangar

[mshac]

That can't be right. I must have linked to the wrong product. I'll check in the Bonanza forum I belong to and get the right info. The cheap Bonanza owners I know that have LI batteries would never spend that kind of money on a battery!

[cartrm]

How are you connecting your battery minder? Are you popping the cowl off and opening up the battery box to attach alligator clips, or is it possible to hook something like this up to the GPU port?

https://www.aircraftspruce.ca/pages/...jumperplug.php

[hharney]

Mine is in the GPU door. Works great

[JAG]

I installed the interface kit on my engine baffle - accessible through the oil dipstick door on the front engine. Simple log book entry.

https://www.batteryminders.com/batte...fied-aircraft/

Jeff

[Learjetter]

Update PIREP on Concorde RG24-16

I installed a new RG24-16 in Sep 2020, and it’s been on the Concorde battery minder whenever she’s in the hangar.

Tuesday morning hangar temps in the 40s, and got an initial no-start and VM showed 22v. 2nd attempt got engines started. On landing, she showed 24.6 on VM.

Friday, after three days on the ramp at the out-base (not on charger) with temps in the 30s, she showed 21v and no start. Had to use GPU to start up.

Landed after a 1.5 (day, VMC) and she showed 24.5v.

I’m thinking I got 4 years worry-free from the RG24-16, and it’s time to replace.

[n86121]

CAPACITY
Being a nerd, the last time I checked, the concord had 14 AH capacity and the Gil around 10 AH. As to starting, unless you are cranking so long to eat up a a battery, it doesnt matter (for starting, but more about useful life later)

ONLY USED FOR START
Once even one engine is running (above maybe 1,000 RPM for the alternators to, like a cheap woman, 'put out'), the load SHOULD shift entirely to the alternators.

The batteries are then being recharged from excess capacity from the alternators, as well as acting like big filter capacitors on the power bus while charging.

LONG TERM FLOAT VOLTAGE
Different battery chemistries have different optimal voltages for sustained charge (battery minder). While any 'ye olde charger will bring any battery up, "amps are amps." The caveat is what happens when left on a charger for an extended time. That's why better chargers have selectable settings for different batteries, that set the max output voltage appropriate for each type of chemistry.

If the long-term float voltage is a wee bit too high it will slowly 'boil off' (more like slowly simmer) the battery chemistry internally. Over time internal battery resistance will go up, seen as decreased capacity and weak starts under high starter loads.

Similarly, if the alternator max output voltages are too high, like using the wrong battery charger over a long term, you may be cooking your battery chemistry a bit each time flying.

Each time a battery cycles through charge and discharge, its internal chemistry is getting mixed and slightly diluted, so they get weaker over both time and number of cycles.

Thats also why EV manufacturers say to avoid fully charging batteries, the last bit up to the redline charge that works the chemistry hardest.

HOW TO GET MAX YEARS
I go with the max capacity concord. Having more AH initially has ZERO impact on starting (unless you have to keep cranking for extended times), but more importantly, as it ages, it will take more years before its slow decline in capacity gets too low to start the airplane.

CHARGING FLOAT VOLTAGE
I also swallowed hard and bought the specific charger made for it ($300 vs $15), because the precisely right float voltage and desulphating meant the battery would last the longest.

ON TIE DOWN
Lastly, on my tie down, I have a marine gel cell trickle charged by solar panel in a tie down box, with a 12 vdc to 120 VAC inverter, and the $300 charger made for the concord battery.

In my airplane, my 2nd cig lighter(passenger side) is wired to the battery (near master solenoid) with a 7 A fuse. That way I can connect quickly to the battery anytime. Whenever I want to refresh or top off my battery, or do database updates, or whatever, I just plug the $300 DC charger output into cig lighter #2 and presto, battery fully charged and being de-sulphated. The max I leave even the fancy charger on is overnight, and then only occasionally.

FAST CHARGE
I spoke with a concord engineer some years back. He claimed their batteries could handle high current charge just fine, (as they do everytime the airplane is running after the batteries get low).

Within reason of course, 200 AMPS into a near dead battery wont end well, as it would produce too much internal heat. But the typical 4 or even 10 amps from a charger wont hurt it.

Slow charging for extended times is always happier then jamming it all in at once, simply from a heat management standpoint, A 10A charge into a 12 volt battery is literally like sticking a 120 watt light bulb inside the battery.

But most basic chargers are just voltage devices (not constant current), that put out just a bit more voltage than the battery. As the battery under charge voltage gets closer to the chargers intrinsic output voltage, the current into the battery drops off. Which is also why the last 5% takes so long.

And enough about that!

[Kim Geyer]

Go to Concordes web page and get the procedure for a conditioning charge or a deep recovery discharge. I’ve done them and have brought a battery back to passing it’s cap test.
You will need a constant current charger.

[White Lightning]

Hello everyone, I am a new member to the forum as I am a new owner to a 1963 C336 N480WL (hence "White Lightning"). The previous owner unfortunately is suffering dementia so I am not able to ascertain the reason to the following question...
This aircraft has TWO battery boxes (one on the pilot side - factory location, and another on the co-pilot side - above the fuel filter) and the positive & negative battery cables have been wired in series so I am "assuming" that there were 2 12v batteries (since no battery was in either box nor do these boxes allow a 24v battery to fit yet the dimensions fit a 12v battery).
Anyone ever heard that Cessna did a 2x12v from factory option? Any excellent reason to have it this way (I don't like the idea or expense of buying 2 batteries nor the issues caused with potentially imbalanced batteries/charging)?

I would appreciate the collective thoughts and wisdom from this group!

p.s. Having owned many aircraft since 1990s, I have enjoyed amazing results from Concorde batteries vs the Gill counterpart. It gets even better when you choose to utilize the specific BatteryMinder made for Concorde!

[mshac]

I can't speak to the 337 of 1963, but my 1961 310 used two 12 volt batteries from the factory to create a 24 volt system. They were both in the same battery box though.

[n86121]

The deeper a battery is discharged, the fewer cycles you will get from it.
The chemical process going back and forth each time is not perfect.

If your battery is allowed to get low then used for a slow and low start,
that's taking it for a deep cycle.

On the AGM batteries we use for our solar equipment we get 5-7 years of DAILY cycles.

But those cycles are less than 5% discharge each time, so last for years.
As designed.

Better to keep your battery trickle charged from a small solar charger,
to offset its internal loss rate,
than to let it get low.

And then start at or near full charge each time, so the battery doesn't deeply discharge.

---

I am amused by the claims of EV's. Only in the fine print are you advised to avoid charge over 80% or under 20%. Which means at best, on average, you should limit your use to only 60% of the advertised 'range' (And that's when new).

Then age the battery, get it very cold, deeply discharge it a bunch of times,
charge to 100% for some long trips...etc....

Don't get me started.