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 Posted: Thu May 13th, 2021 12:22 am
1291st Post
Rod Hutchinson

Joined: Fri May 8th, 2009
Location: Mooroolbark, Australia
Posts: 559
I have used 2 batteries, with a step-up to 9v from 7.4v
Works a charm on OEM motors. 

No problemo if you have a roomy tender, regardless of scale.

You will need a balanced charger, but otherwise easy to set up. 
Batteries can be charged in situ or outside.

Rod Hutchinson
Mooroolbark, Australia
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 Posted: Sat May 15th, 2021 02:30 pm
1292nd Post
Randy Decker

Joined: Sun May 2nd, 2021
Posts: 31
Are the protection circuits to aid in Charging ? 
If so, it seems to me most of the chargers for Li-Po are controlled really well.

They will balance batteries as they charge,
because they charge the individual batteries, and not just the whole pack.  

Or, is this to protect against the low voltage thing ?   
I had not heard of that before.  

And is the 3V level correct?  
And if so, is this what the regulators do, is to stop the discharge at 3V ?  

It seems to me you would loose a good amount of your usable mAh this way.    
I mean the batteries are only 3.7 Volts to begin with, right ? 

So how can a number of 3 Volts be accurate?  

Just trying to figure all this out...

Can't go into this without as many facts as I can find.
And you guys seem to have worked a lot of this out.


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 Posted: Sat May 15th, 2021 02:45 pm
1293rd Post

Joined: Sun Feb 17th, 2013
Location: Friedberg, Germany
Posts: 1252

Just one of the many guides to understand and use LiPo batteries

Regards, H.
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 Posted: Sun May 16th, 2021 08:07 pm
1294th Post
Bob R

Joined: Thu Nov 20th, 2014
Location: Springfield , Nebraska USA
Posts: 653

A battery protection circuit does several things. 

Typically they provide -
current protection for excess amperage,
over charge protection,
over discharge protection,
short circuit protection,
excess resistance protection,
and thermal protection. 

Some balance charge the cells. 
They are usually larger units.

A Li-Po cell has a nominal voltage rating of 3.7 volts. 
Fully charged they are 4.2 volts. 

A typical low voltage cutoff is 3.0 to 3.4 volts,
depending on the parameters of the individual circuit. 

If a battery is wired with a protection circuit,
the protection is kind of redundant to most quality chargers internal circuits. 

Balance charging (if not a function of the battery protection circuit)
requires specific wiring, usually with a balance plug arrangement.

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 Posted: Tue May 18th, 2021 06:40 am
1295th Post

Joined: Wed Apr 3rd, 2013
Location: United Kingdom
Posts: 208
The low voltage cutoff is to protect the battery.

If the battery is discharged below about 3 Volts,
then it cannot safely be recharged with a normal charger.

Indeed many chargers will refuse to recharge a battery,
that has too low a voltage.

So it prolongs the life of the battery.


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