[sdiy] Cheetah MS800 replacing NiCd Varta Mempac
mbryant at futurehorizons.com
Thu Jun 3 17:07:10 CEST 2021
I've always dropped in NiMH into NiCad slots okay. But that's no guarantee. As you say not getting rid of the old one is a far worse scenario.
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Richie Burnett
Sent: 03 June 2021 15:30
To: synth-diy mailing list
Subject: [sdiy] Cheetah MS800 replacing NiCd Varta Mempac
I'm currently servicing a Cheetah MS800 digital wavetable synth and want to change the old NiCd Varta Mempac to a brand new NiMH Varta Mempac before putting it up for sale.
The old blue NiCd battery hasn't started to leak yet, and is still holding it's charge but I know that old NiCd Mempacs are regarded as a ticking time-bomb in equipment of this age (>.<) I wouldn't feel comfortable selling it without addressing this issue first.
The existing 100mA 3.6V NiCd trickle charges from the 5V supply rail through a 1k resistor when the unit is powered up. Should I be looking at changing this trickle charge current when changing the battery type to the 150mA 3.6V NiMH replacement?
I did a search online and found very little solid information about this.
Everything from "The NiMH Mempacs are a drop in replacement" to "you need to decrease the trickle charge current because NiMH is less tolerant of being overcharged" The trickle charge current already seems low to me.
I would be interested to hear your thoughts!
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