This is an old post, preserved for reference.
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When working with old computers, one thing you find yourself doing a lot is burning EPROMs, and that tends to lead to picking up various EPROM programmers. This is my latest, kindly donated by The Future Was 8 bit, who found he had two of them.
10 Fujitsu 950 mAh NiHm cells, and installed 7 of those instead. They have been in use for a while now, and the battery is still showing full, so I think that is a result.