For me, estibot is showing $37k valuation, ha ha. You should have paid double!
This is the kind of niche product name that was a good buy up until around 6 years ago, as it was ideal for a simple minisite (a small, sparsely-developed website usually monetized with Adsense ads) or a store. Back then it was still fairly easy to rank these kinds of domains/minisites onto the first page of search engines if you knew a little about developing and optimization.
But there was a huge glut of minisites and stores, with minimal development, such a massive and horrible glut of crappy websites built around exact match niche domains like yours, that google & other engines changed things up. It's now quite difficult to get a minisite ranked anywhere high in the serps with these exact match domains, especially when your niche site with niche keywords is up against the huge store sites selling the same product.
Google has changed their search algorithms a few times since then and made it quite difficult to rank your minisite/store unless you put a LOT of work into it, a lot of seo and marketing. Some of us still squeak by if we know what names to pick and how to develop them properly, but as a generalization most exact-match keyword domains with small websites are difficult to get enough traffic to to make any worthwhile income. And with the economy poop a few years ago, there are fewer targeted advertisers, with lower ceilings to their click amounts, using fewer Adwords keyword combinations, so content-sensitive ads like Adsense don't pay what they used to.
And ad-fatigue has increased, people just don't click on ads like they used to. And visitor-trust is a sketchy thing; a visitor who sees the same ad for a product on Walmart's site and on nimhbattery dot com side by side on google, will click the walmart link. Some exceptions of course, but this is still another safe generalization. Your domain is so niche that IMO you have almost zero chance of getting it to page 1 in the serps, and I foresee it will make you almost no income to speak of.
It's also not that strong of a term, even as a niche. Electronics or science niches are pretty tough to optimize so they rank higher in the serps than the large stores who sell these niche products. Only 1600 exact monthly searches in the US for NiMH battery, and a little over double that for the plural batteries. Not that great. Obviously estibot is giving it the large valuation based on the other factors (links etc from being previously developed) rather than the search numbers. And those other factors can disappear slowly or quickly in the near future as people and 'bots see that the old website pages are no longer there (even though you have new content/store on there)
Better niche domains than this are being dropped every day. They are domains that had their hay day during the minisite/store boom, but have become devalued now as income earners. People have paid thousands for names like these years ago... and now they're letting them drop. I predict no end user will buy this, but if you can sell it to someone who can make better use of the existing links etc they might figure they can make some sort of income.
How long have you had it? Any traffic stats to give us yet? Mostly it will depend on how much traffic still filters in from the previous backlinks, because I don't see you being able to rank it on the search engines high enough to get any traffic there... you're competing against pages from ebay, amazon, walmart, and you're only competing with a store with little content other than product ads... which 'bots don't consider 'strong content'.
But good luck; too early to say if it's a 'bad buy', until we see if you make any income from any existing traffic. Maybe it'll do okay. At least you're thinking about things and not buying blindly. You just didn't know about this type of domain no longer being particularly worthy anymore.
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