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Alkaline charging followup

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.
Reply to
Bert
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And the number of spontaneous exploding charging cells is still zero, I guess ?

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Kind regards,
Gerard Bok
Reply to
Gerard Bok

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

110

voltage

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.

Reply to
Bert

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

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Kind regards,
Gerard Bok
Reply to
Gerard Bok

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

Reply to
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.

Reply to
Mike S.

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.

Reply to
Bert

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