M
Mike S.
Guest
In article <EqCdnZYSPdiogpbZRVn-ug@is.co.za>,
Bert <lijbertv_at_xsinet_dot_co_dot_za> wrote:
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 <lijbertv_at_xsinet_dot_co_dot_za> wrote:
Seems like a lot of babysitting effort just to recharge a battery. Are you----- Original Message -----
From: "Gerard Bok" <bok118@zonnet.nl
Newsgroups: sci.electronics.repair
Sent: Sunday, March 05, 2006 1:44 PM
Subject: Re: Alkaline charging followup
On Sat, 4 Mar 2006 21:50:42 +0200, "Bert"
lijbertv_at_xsinet_dot_co_dot_za> wrote:
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 ?
--
Kind regards,
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.
Greetings
Bert.
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.