Help - Problem charging old UPS dead battery's

[TanTric]

thats what im going to do, thank you everwiser!



about my other battery, there's nothing more i can do beside to give that battery a funeral?

If you'd like to keep using it, you should drill a small hole at each end of the crack (to keep the crack from spreading further) and then you could seal the crack/holes with a two part epoxy for a permanent repair. Being the electrolyte is not quite a liquid, I think this would allow you to keep using the battery without leaking any of the acid/electrolyte.

[SeaMonkey]

May I ask what method you have used that works well for you that you have found?

I use a Pulse Driven MosFet type of Desulfator Circuit
(modified) to charge batteries. Since it uses a MosFet
for switching I use a small transformer DC power supply
to energize the circuit (14 Volts). The pulses are
generated by a CMOS chip (CD4001) which is configured
to produce pulses of about 10 uSec (adjustable) at about
3 KHz.

The inductor I'm presently using is a hand wound
40 turns of magnet wire on a silicon steel core (several 'I'
sections from an old 'EI' transformer). I take the flyback
pulse directly from the inductor, through an isolating
Schottky Diode, to the battery being desulfated/charged.

Ferrite core inductors of about 100 uHenries to 500
uHenries work well also. Pulse Width must be
adjusted for best results.

I like the versatility of a pulse generator circuit
that enables adjustment of frequency as well
as pulse width; and the MosFet switch which
results in highest efficiency.


Joule Thief Charger

That is an interesting, well done video.

His basic circuit would operate more effeciently if he
should place a small capacitor across his base resistors.
A speed-up capacitor of about 0.01 uF in the base
circuit would improve base drive to the 2N3055 which
would result in more efficient switching with a slightly
smaller current drain.

The 1N4007 dode that he is using to extract the
flyback pulses is not very efficient at the frequency
the circuit oscillates. A high efficiency ultra fast
diode would be much preferred for increased efficiency.

Link

[Bob Smith]

I've found this charger useful for reviving sulphated lead acid battery.
12V 60A car battery , maybe dead?
All the best,
Bob

[TanTric]

...

@jeanna

my JT charger was not so sucesfull with my damaged battery as i was expecting, the charge was weak, so i tryed your way, by alternating types of charge and now the battery is really coming to life again!!

thank you

Hi juju,

I have spent the last 9 days in the very battery hole you are in.

I heard the charger start up one morning, and instead of stopping in 10 minutes as it usually does, it continued to be on for 5 hours. I pulled the plug and eventually opened up the battery pack.

(It is a xantrex 1500 which is a full power supply with 3, 12v batteries in parallel, an inverter and charger.)

Well, all 3 batteries showed to be under 10.5v, but one was at 9.36v.
I applied my jtc which I had rigged as a charger (I will look for slayer's in a minute) and as I said it has been 9 days, but now, I have 2 batteries fully reconditioned and recharged to where they hold the charge and one that is still under, but still growing.

Here is what I have been doing that is working.

I use the jtc charger, and the volts first go up then down, but I just keep it there until the volts are lower than they were before beginning that round.
Then I switch to a regular charger.
The volts jump up to a new, higher level and gradually go down.
When they reach the lowest point, again, I switch to the jtc charger.
These rounds have been taking about 8-12 hours.
Since I was reconditioning 3 batteries and only had 1 of each type charger, the timing was different in the beginning, but after a while it seemed that this worked the best.

Perhaps others have experience to share.

I was planning to share all this after it is finished, but you asked so I am sharing it now.


So, the short answer is use both types of chargers back and forth until they are charged.

jeanna

[TanTric]

thanks

SeaMonkey and Bob Smith, thank you for the good references!

I've found this charger useful for reviving sulphated lead acid battery.
12V 60A car battery , maybe dead?
All the best,
Bob

[sucahyo]

0.5A charge

I think no matter what circuit you have, make sure that you have at least 350 mA on amp meter in series with charged battery. That is Bedini suggestion.

If you only have <50mA, I don't think you will revive it.

[EthelAether]

I dunno, man. Sounds like your 'friend' is getting the better part of the deal.

Not sure how it works around there, but where I live, we have to *pay* to get rid of dead lead-acid batteries.

[TanTric]

...

really?

do they recycle this old baterrys, or just garbage with them?

I dunno, man. Sounds like your 'friend' is getting the better part of the deal.

Not sure how it works around there, but where I live, we have to *pay* to get rid of dead lead-acid batteries.

[everwiser]

There's a "core" charge you have to pay when buying new battery if you don't give them the battery you're replacing (at least there is on vehicle & lawn equipment batteries) here in the states. My local recycler used to pay $8.00 per battery but now they do it by how much it weighs which varies throughout the year. The nice thing is, they'll let me buy old batteries from them at the rate which they paid for them so I can easily get used batteries. They may or may not be able to be recovered but I can get them cheap compared to new units.

[totoalas]

Desulfate and fast charger

Hi to all
dodohlodos jt ckt can revive alkaline batteries and lead acid batteries
How about a fast charger for car batteries that were drained off when headlight or alarms were switched on continuosly
I saw a portable charger used in my car to rev up my drained batteries in 10 minutes

Anybody have this kind of circuit?????
A triac and 2 -500 uf cap 600v were connected to bi and b2 of the above ckt
but not tested yet on car batt

Groundloop thread on 12v 60 ah L3 maybe can be added for desulfating?????

cheers
totoalas

cheer

[sucahyo]

There's a "core" charge you have to pay when buying new battery if you don't give them the battery you're replacing (at least there is on vehicle & lawn equipment batteries) here in the states.

In Indonesia, you can sell broken SLA for $0.5. Broken car battery worth $8. My relative buy new car battery for $40 - $8 = $32.


@totoalas, even radiant charger can be a very fast charger if you raise the output.

[totoalas]

Joule thief Booster charger

[IMG][IMG=http://img295.imageshack.us/img295/1585/jtcharger004.jpg][/IMG] Uploaded with ImageShack.us[/IMG]

In Indonesia, you can sell broken SLA for $0.5. Broken car battery worth $8. My relative buy new car battery for $40 - $8 = $32.


@totoalas, even radiant charger can be a very fast charger if you raise the output.

Hi Tantric Sucahyo and all


I copied this circuit from Dodshlodo video response ayear ago from Thelron Stark
Ive replicated it and works well for 1 amp application the charger sla
and the other charger for car battery unfortunately the neon lamp burned the plastic insulator when i tried to charge a 60 ah batter

Hope you can help me check/ improve the circuit......
The L3 in Groundloop 60 ah battery charger/ desulfator ,,,can I connect the triac??????
for added protection the series cap by Sucahyo??????
Tantric Hope you can make a super fast charger desufator for most type of batteries rolled into o ne

cheers
totoalas

[sucahyo]

The L3 in Groundloop 60 ah battery charger/ desulfator ,,,can I connect the triac?????? for added protection the series cap by Sucahyo??????

You want to protect what?

I use 250V cap and it still working now even if the circuit produce >1000V on open connection. I have been charging at 500mA rate for many months now. The only time I experience busted transistor was when I connect a charged battery while the circuit still running.

[SkyWatcher]

Hi folks, Hi totoalas, i would not use a joule thief circuit for anything over 6 volt input. I've tried different ways to remove the heat from the transistor using 12 volt input with JT circuit and nothing worked. I would use either John B's solid state circuit or the 'big boy variant'. The 'big boy variant' is the one to use if you need to charge large batteries. Here are the two circuits.
http://a.imageshack.us/img291/1392/ssosccircuit.gif
http://a.imageshack.us/img291/504/ex...olidstater.jpg
peace love light
Tyson

[SeaMonkey]

Heat is always a problem when using a bipolar power transistor.

A MosFet version of the circuits is readily constructed with a
common CMOS chip, an N-Channel MosFet and a single inductor
(no need for a transformer) which will run cool to the touch.

Should anyone be interested a circuit diagram can be provided.

The CMOS chip is configured as a pulse generator with provision
for adjustment of pulse width and pulse frequency. The circuit
operation can be optimized for virtually any inductor greater
than about 50 uHenries. This means that an inductor with very
low DC resistance can be used which will deliver more power
to the battery being 'charged' or 'desulfated.'

My own version of the circuit operates at about 3 KHz which
I've found to be ideal for charging NiCd, NiMH and lead acid
cells/batteries up to 12 Volts 7 AH.