LinnDrum/K250 Battery Question

[Rob]

-----Original Message-----
From: Harry Bissell <harrybissell at prodigy.net>
To: sexsymbol at execpc.com <sexsymbol at execpc.com>
Cc: synth-diy at mailhost.bpa.nl <synth-diy at mailhost.bpa.nl>
Date: Sunday, June 27, 1999 1:50 PM
Subject: Re: LinnDrum/K250 Battery Question


>Hi Tim:
>
>Tim Curtis wrote:
>
>> I just replaced the 3 Ni-Cds in my LinnDrum with replacements that I got
>> at the local "Batteries Plus".  The ones they sold me are 940 mAh as
>> opposed to the 500mAh rating of the old ones.  They told me it wouldn't
>> make a difference, but I figure I should probably ask here.
>
>Will probably work, but will take much longer to charge... Leave the unit
on
>more often every now and then (overnight) and you should be OK.

Nah. It will charge to 500mAh in the same amount of time that the old one
did.. So it shouldnt be a problem..
(I run massive amounts of testing on batteries of various types, so I know
enough to be dangerous!)
Now, if you want it to last for 940mAh, well sure, it will take about twice
the time, which shouldnt be long in the first place..

>> Also, I needed to get a replacement battery for my K250, a Varta Mempac,
>> also a Ni-Cd.  The only replacement that's available is the "same
>> battery" in a NiMH.  Any reason that I can't use that one?
>
>Risky... very Risky. The NiMH has a much tighter spec on recharging and
>discharge, so if the circuit isn't designed for it it may go BOOM. Contact
>Varta for info and try to match one up. Maybe Tadiran has a cross...  If
you
>come off as an engineer you might even get a sample...  :^) Harry


Well, yeah, you have gas discharge from the Nimh when its charging.. But Im
not sure how critical it is with such a small cell...
I would say open the case, put the battery in, turn it on, and monitor the
temp on the battery.. If it starts getting hot, turn the machine off and
remove it..
Ill ask one of the battery engineers at work about the ramifications, cuz
now im curious too..

Rob