rechargeable batteries

[zooz]

Hello
How can I charge a rechargeable battery in the lab, what's the
'reverse connection'?

 

[Phil Allison]

"zooz"

How can I charge a rechargeable battery in the lab, what's the
'reverse connection'?

** You use the normal connection - ie positive battery terminal goes to
positive terminal of the charger.

But the charger has to have higher voltage available than that of the
battery.

Plus, you need to add a resistor in series with the DC supply to limit
current flow.

The charging reaction commences immediately and the voltage on the battery
can be seen to gradually rise on a sensitive volt meter.

What happens next depends entirly on the kind of battery, its size and the
current flow you set up.



....... Phil

 

[zooz]

"zooz"


** You use the normal connection - ie positive battery terminal goes to
positive terminal of the charger.

But the charger has to have higher voltage available than that of the
battery.

Plus, you need to add a resistor in series with the DC supply to limit
current flow.

The charging reaction commences immediately and the voltage on the battery
can be seen to gradually rise on a sensitive volt meter.

What happens next depends entirly on the kind of battery, its size and the
current flow you set up.

...... Phil

i have another question,

-i have to charge two 1.2 v batteries, do i connect them in series and
then the free positive terminal to the positive of the charger and so
the negative?
-and how do i know the limit of the current?

thaks

 

[Phil Allison]

"zooz"
"Phil Allison"

i have another question,

** No surprise......

-i have to charge two 1.2 v batteries, do i connect them in series and
then the free positive terminal to the positive of the charger and so
the negative?

** Series is OK.

-and how do i know the limit of the current?

** Gotta know all about the particular cells for that one !!

The maker's web site usually has the info - or it may be written on the
cell's jackets.




....... Phil

 

[John B]

Hello
How can I charge a rechargeable battery in the lab, what's the
'reverse connection'?

WTF. Go and buy a $5 charger from WalMart.

Next question.

 

[John Devereux]

Hello
How can I charge a rechargeable battery in the lab, what's the
'reverse connection'?

What sort of battery (NiCd, NiMh, Lithium, lead-acid, etc)?

 

[D from BC]

What sort of battery (NiCd, NiMh, Lithium, lead-acid, etc)?

I'm wondering if any of those battery chemistries can be safely
charged by temperature monitoring..
Assume one doesn't have datasheets and doesn't care about charging
damage..(Survivor Man does battery charging... )
I dunno...let's say charging up to an external battery temp of 40C???


D from BC