Advice replacing coin battery on trapdoor RAM.

[Ral-Clan]

Hi, I've got an Amiga 500 with a SupraRAM 512K expansion in the trapdoor.  It has a real-time-clock on board that is powered by a coin battery (now dead).

Here's a great picture of the exact board I have and battery:
http://www.amiga-hardware.com/download_photos/supraram500rev1_top_big.jpg

I need to replace the coin battery.  The current battery is electrically bonded to the contacts on the board, so I will have to de-solder those.

I want to put a coin battery holder in there, but I need to know if I should put a diode so that the Amiga doesn't try to charge the battery.

I'm guessing that because the CURRENT dead battery is ALREADY a coin type (2032), then it probably wasn't rechargeable to begin with, and therefore I don't need to add a diode.

But I just want some confirmation of my theory before I go ahead with the modification.

Thanks.

Here's the battery that's already installed on the expansion board:
http://en.wikipedia.org/wiki/CR2032_battery

[Ral-Clan]

Good eye both of you....especially catching that diode at D1.

I already have a coin battery holder...and CR2032's are really common, so I'm going to go ahead with this mod.

Thanks everyone.