Console bulkhead battery source

I have a BA215 DECsystem 5400 whose NiCad battery pack for the TOY clock and console settings has finally given up the ghost. It consists of three AAA 1.2V 180mAh NiCads shrinkwrapped together leading to a Molex 2695 two lead connector. 1) Does anyone know a source for these other than Compaq? I cringe to think what they would charge for one. I admit that I am something of an ignoramous regarding electronics and read with envy when others post about finding easy fixes for blown power supplies and the like. With this in mind: 2) does anyone know easily offhand if other 1.2V battery packs could be used in its place? There seem to be two or four cell AAA battery packs available on the web but would these work in this scenario without damage to anything? I did not find any three cell packs. What are the rules of thumb for what would or wouldn't work? Somewhat related question just because I am curious: 3) is the console bulkhead on my 5400 the same as is used on other QBUS DSSI Mayfair MicroVAX 3x00? Mine has a part number 70-25775-02. I guess I would be surprised if it was different. --