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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 03-27-2015, 06:34 AM   #1
Eddy
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Default Accucell 6 Storage Mode ?

My Accucell 6 will only discharge my 4S packs at .300 mah. That takes a long time to discharge a pack, is it adjustable, and can the discharge process to the storage voltage be sped up ?

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Old 03-27-2015, 09:10 AM   #2
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Plug the battery into the model... run it down using the motor. 5 to 10 minutes vs many many hours
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Old 03-27-2015, 09:38 AM   #3
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No that's it.

The budget chargers all keep discharge rate down because only way they can get rid of the excess charge is by heat.
You can buy a much more expensive charger and get better rate, but in all fairness its asking a charge to do another job very ineficiently.

Much better to have a separate discharge apparatus.

I designed / built a light bulb discharger, cost me about $15 all in and dies a very good job. I have a cell checker monitoring voltages if cells that alarms at user set level.

Then I saw a post on RCG showing a cheap and effective commercial product. Fully automatic, 2 to 6S capability, 100W discharge rate controlled by chip. User settable cut off points. Individual cell voltage display throughout process.


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Worth every penny and I just used similar piece of wood to fit bulbs to.

Beware though, there are various similar on eBay but without the controller board / lamps. Just the display box, which is good for cell checker but do not try discharge without the bulbs.
Get the setup as shown in the video and it will sort those lipos easily and without hassle.

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Old 03-27-2015, 02:45 PM   #4
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Discharge power on the Accucel along with most other 50W chargers is a laughable 5W. That means that if discharging a fully charged 4s Lipo (about 16V) then the discharge current is calculated at 5w/16V = 0.31A

So that's why you can only discharge at 0.3 amps

More powerful chargers have much better discharge power but bang for buck the discharger that Nigel showed would be hard to beat.
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Old 03-27-2015, 03:01 PM   #5
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I think some of the chargers that have a regenerative discharge feature can discharge at higher rates because instead of dissipating all the charge as heat they use a lot of it to recharge the source battery.

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Old 03-27-2015, 05:57 PM   #6
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Yes, that's true of Powerlab and iChargers. Dual channel iChargers will also discharge a battery into a battery or resistive load connected on the second channel of the charger. This is what i do with my icharger Duo, I connect a converted hairdryer to the second channel and hook up batteries to the first channel and can discharge at up to 1000W.
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Old 03-27-2015, 06:24 PM   #7
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Originally Posted by JetPlaneFlyer View Post
Discharge power on the Accucel along with most other 50W chargers is a laughable 5W. That means that if discharging a fully charged 4s Lipo (about 16V) then the discharge current is calculated at 5w/16V = 0.31A

So that's why you can only discharge at 0.3 amps

More powerful chargers have much better discharge power but bang for buck the discharger that Nigel showed would be hard to beat.
Its actually 150W ... and to say it amazes me everytime I use it is understatement.
In fact this thread reminded me to buy a second one !

Its actually $16 + $6 shipping to me ... and even my home made set-up that matches Watts cannot compete.

The machine goes further than just discharging ... it will BALANCE ... CELL CHECK .... Rx batt check ... all sorts ...

AND it leaves your charger to get on with the real job it was designed for.

Nigel

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