[sdiy] Cheetah MS800 replacing NiCd Varta Mempac

Joel B onephatcat at earthlink.net
Thu Jun 3 17:51:21 CEST 2021


Not sure if still possible but I was able to find a company selling replacement nicads that looked like they matched the spec of my cheetah MS6 back in 2016… didn’t want to remove the charging system: 

This is from my receipt:

3.6V 110MAH NICD
Item# NIC0010
https://interstatebatteries.com/

Worked for me.

Joel

Sent from my iPhone 

> On Jun 3, 2021, at 8:10 AM, Mike Bryant <mbryant at futurehorizons.com> wrote:
> 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.
> 
> -----Original Message-----
> 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
> 
> Hi all,
> 
> 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!
> 
> -Richie, 
> 
> 
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