The Kawai & Teisco Analog Synths Group

To replace the battery type with Lithium you should block the 
charger, otherwise the battery would explode (it is not rechargable).

To do that, replace the battery with a coin cell 3v lithium one,
while placing a a 1N4148 diode with the positive side of the diode 
facing the positive side of the battery, connected to the 1,5K 
resistor on its other side.

I've done that on a few instruments including my SX210 and so far it 
works fine.



--- In kawai_sx210@yahoogroups.com, "faisanvideo" <faisan@...> wrote:
>
> In defence of the notorious Ni-Cd 3.6v 50mah (see Photos) I would 
like
> to say that I purchased my SX-210 back in 1982 and I have only
> recently replaced the Memory Battery due to leakage; that's 23 years
> not bad going in my estimation. But it has to be acknowledged it can
> cause damage to the circuit board if left unchecked; I was 
fortunate I
> only had superficial damage easily put right with a little help from
> group member's advice.
> Unfortunately I too was unsuccessful in finding the details in the 
old
> group records on how to convert to Lithium with a blocking Diode (to
> prevent charging?)(Why prevent charging?) Or did I miss read it! in
> the end I settled (with great success)on a replacement Nick Metal
> Hydride Memory Backup Battery 3.6v 80mah available from
> http://www.rapidelectronics.co.uk/ Order Code: - 18-1625 .£2.05p 
plus
> P&P & VAT.  This site also has a range of jack plugs and sockets etc
> including right angled plugs which I found particularly useful; they
> have no minimum charge only postage.
> Another site in America has the Ni-Cd 3.6v 60mah @ $5.95 but
> operates a minimum order charge of $50, Plus Carriage.
> http://partsexpress.com/ Part No: -141-102. Hope you find this
> information useful; Regards, Clive. 08.02.06.
>