On my Nikon d40 it lasts for a long time, when you first got it you should have killed the battery all the way then charged it to the max without unplugging and then your battery should be good.
The nikon D40 camera is an entry level model in the nikon line up of digital SLR's. It was made with the the intention of capturing an audience of consumers that would conventionally purchase a point and shoot camera. In other words this camera was not designed for rigorous and serious photography, hence the reason for its short battery power. As a matter of fact you may notice that the battery life of a D40 actually is shorter than a comparable point and shoot camera. This is because the battery nikon used in the D40 has the same "lithium strength" as most high end point shoot cameras but will perform more battery draining functions because it is in essence an SLR. The D50's, D70's etc were not designed for the same consumer market as the D40. If you compare these cameras to the D40 you will notice they are physically bigger, have a stronger built quality, they have a top LCD etc. all to show that these cameras were made for an amateur photographer market as opposed to the point and shoot consumer. Furthermore, batteries that are used in higher end cameras like the D80 and D200 can also be used in a D50 but not in a D40. Further showing that the D40 is rather like a 'stepchild' in the nikon DSLR family, than a bona fide nikon DSLR. There are other issues like lens compatibility that are a problem with the D40 when compared with its bigger siblings.
Nikon d40 is great and is plenty even as of this writing 8-5-09 http://www.kenrockwell.com/nikon/d40.htm
You can buy a remote for the Nikon D60 but not the Nikon D40
A Nikon D40 kit can be purchased from the Amazon website. The Nikon D40 is a camera that is highly rated by people who have bought it and provided feedback on the Amazon site.
The Nikon D40 camera is a discontinued mode. However, the Nikon D40 can still be found on eBay, Amazon among other online retailers. Best Buy has refurbished D40 cameras for sale.
They are virtually the same same; they have the same dimensions, the d40 is slightly lighter.
The D40 has less megapixels but is better at high isos, so is more sensitive.
Yes
The Nikon D40 camera is available at most electronic retailers that sell computers, cameras and other electronics. Future Shop and Best Buy are two retailers that sell Nikon D40 cameras.
pixies and fairy-dust
The Nikon D40 has a very bulky look to it and is very stylish. It comes with 18-55 lens that is removable and is available for approximately $599.00 US dollars.
All lenses with Nikon mount are compatible with Nikon D40. If the question rephrase : "What lenses are able to autofocus with Nikon D40", then the answer is : the new Nikon AF-S lenses (with Silent Wave Motor inside), Sigma lens bearing HSM code, and upcoming Tamron lenses (18-200mm, 17-50mm and 70-300mm).