Yashica are a brand that I have been collecting for years. Whereas many people tend to recommend the Electo range GT, GTN, GS,GSN etc. I would suggest that you tried something that wasn't dependant on batteries.
My own choices would be The Lynx 1000; Lynx 500; Lynx 14; Minister III; Minister D, or Minister II. Many of these don't even require a battery for the meter. The trouble with the battery models is that they frequently require a full CLR before you can use them, whereas the batteryless models usually work as soon as they arrive at your door.
They are also amazingly cheap, frequently selling for between 10-20 Pounds stirling on Ebay, or even less. Why don't you try half a dozen, you won't be disappointed, the Yashinon lenses are excellent.
Finally, if you do decide that you would rather a battery model, or if you buy a model where the meter requires a battery (I usually tend to use an old Euromaster hand held meter - consequently the 'onboard' meter doesn't bother me) you may require a battery adaptor which can be bought for about 12 Pound Stirling on Ebay, or go to
www.yashica-guy.com/ where you can buy them equally as cheaply directly from his webpage.
P.S. I am not Yashica-Guy, neither do I know, or have any business with him.