Alkaline charging followup

[Bert]

Hello all
December around the 21st last year I did have a question on charging a
rechargeable alkaline AA battery.
Using those 2 in my wireless optical mouse.
Normal battery did last 1 month
Alkaline battery did last 5 month,
Alkaline recharge battery 2.5 month, empty reading is 1 volt.
Started charging both batteries on 1.68 volt, the charging current was 110
mA per battery.
Charging current after 10 hour is 95 mA for both batteries, constant voltage
1.689 volt.
Hope this will help someone sometime.
Greetings
Bert.

 

[Gerard Bok]

December around the 21st last year I did have a question on charging a
rechargeable alkaline AA battery.
Using those 2 in my wireless optical mouse.
Normal battery did last 1 month
Alkaline battery did last 5 month,
Alkaline recharge battery 2.5 month, empty reading is 1 volt.
Started charging both batteries on 1.68 volt, the charging current was 110
mA per battery.
Charging current after 10 hour is 95 mA for both batteries, constant voltage
1.689 volt.
Hope this will help someone sometime.

And the number of spontaneous exploding charging cells is still
zero, I guess ?

 

[Bert]

----- Original Message -----
From: "Gerard Bok" <[email protected]>
Newsgroups: sci.electronics.repair
Sent: Sunday, March 05, 2006 1:44 PM
Subject: Re: Alkaline charging followup

And the number of spontaneous exploding charging cells is still
zero, I guess ?

No exploding cells, do check every hour or so that the voltage on the
battery stays below 1.7 volt and the battery is still cool to touch.
Remember it is a rechargeable AA alkaline cell.
Greetings
Bert.

 

[Gerard Bok]

No exploding cells, do check every hour or so that the voltage on the
battery stays below 1.7 volt and the battery is still cool to touch.
Remember it is a rechargeable AA alkaline cell.

My apologies.
I missed the part about the cell being 'rechargable Alkaline'.

 

[Bert]

Fouten maken we allemaal een of andere tijd Gerard.
Groetjes
Bert.

 

[Mike S.]

----- Original Message -----
From: "Gerard Bok" <[email protected]>
Newsgroups: sci.electronics.repair
Sent: Sunday, March 05, 2006 1:44 PM
Subject: Re: Alkaline charging followup



No exploding cells, do check every hour or so that the voltage on the
battery stays below 1.7 volt and the battery is still cool to touch.
Remember it is a rechargeable AA alkaline cell.
Greetings
Bert.

Seems like a lot of babysitting effort just to recharge a battery. Are you
doing this as an intellectual exercise, or do you really plan to keep this
going? This is why the commercial chargers used for RAM cells are controlled
by dedicated circuitry. The batteries are pulse-charged, and the duty cycle is
controlled by the voltage of each individual cell as read in between charging
pulses. As the voltage of the cell approaches 1.65V, which is the defined
terminal voltage for a RAM cell, the duty cycle of the charging pulses
approaches zero. Trying to replicate this, over several hours, by manual
checking against a constant-voltage source sure seems like a lot of work.

 

[Bert]

----- Original Message -----
From: "Gerard Bok" <[email protected]>
Newsgroups: sci.electronics.repair
Sent: Sunday, March 05, 2006 1:44 PM
Subject: Re: Alkaline charging followup



No exploding cells, do check every hour or so that the voltage on the
battery stays below 1.7 volt and the battery is still cool to touch.
Remember it is a rechargeable AA alkaline cell.
Greetings
Bert.

Seems like a lot of babysitting effort just to recharge a battery. Are you
doing this as an intellectual exercise, or do you really plan to keep this
going? This is why the commercial chargers used for RAM cells are controlled
by dedicated circuitry. The batteries are pulse-charged, and the duty cycle
is
controlled by the voltage of each individual cell as read in between
charging
pulses. As the voltage of the cell approaches 1.65V, which is the defined
terminal voltage for a RAM cell, the duty cycle of the charging pulses
approaches zero. Trying to replicate this, over several hours, by manual
checking against a constant-voltage source sure seems like a lot of work.


Mike S.
You are right about the babysitting, just wanted to see how many hours are
needed to a full charge, it is around 24 hours.
I will make sometime a pulse charger, keeps me busy.
Greetings
Bert.