It seems to old and homelite no longer has it for download. I would say your best bet is too find a repair shop because most of them have all of the old manuals.
You can find a battery pack for a Homelite UT trimmer at Ebay and Amazon online shopping sites. They offer some of the cheapest prices around.
In the store you bought it in.
lawnandgarden.manualsonline.com/manuals/mfg/homelite
Homelite string trimmers are inexpensive brand that you can probably buy at home depot. Depending on how much trimming you have to do in your lawn, should help you decide on how much you want to put down on a trimmer. I suggest going with a Stihl trimmer or a Poulan Pro. You can probably find a bottom of the line residential unit from these brands for about what you would pay for a homelite maybe a few dollars more, but worth it.http://www.weedwackerstore.com
you can find a users manual or troubleshooting guide for the Homelite rototiller model HTC 12, on the Homelite website. Click on the Service and Support tab and then on Operators Manuals.
Before you can find a manual, you need to know the model number. There are several websites that have free manuals - one of the most popular ones is manuals.com. If you can't find one there, you can Google for the manual you want. Your search field will look like this "manual for homelite xxxxxxxxx" where the x's represent the model number.
If you need an owners manual for a black and decker hedge trimmer, you can find it on black and deckers website. You can also write the manufacturer and they will send you one.
Try the WeedEater website (use Google to find it). I found a down-loadable manual for my line trimmer and my leaf blower.
Yes, the companies give detailed instructions with the cordless string trimmer. They will give detailed manual for using the cordless string trimmer. If they dont any manuals, you can find the instructions in thier company website. Earthwise and Black & Decker provide instructions with the cordless string trimmer. You can read more about them at products.howstuffworks.com
Here is the part number for Poulan... they are all universal from what I can tell (Ryobi, Homelite, etc). Google it to find a seller. I needed 3 of them, so I ordered six since they are cheap and shipping is a lot. Poulan 530095894
http://www.searspartsdirect.com/partsdirect/part-model/Craftsman-Parts/Grass-trimmer-weed-wacker-Parts/Model-536773510/0247/1503820?searchedModel=536.7735.100&blt=
You might want to check out the Weedeater website. I was able to find and download a manual for my Weedeater line trimmer from there. Don't know if they would have one on the lawn tractor, but certainly worth a try.