Keep in mind, the 901, 510, kr808, and I *believe* most of those "starter" models (I say starter because most people begin with one of those three) are not true 3.7v devices. I read somewhere that a guy tested them with a multimeter to find they were closer to 3.1-3.2v. I *think* they make LR 901 attys now... but I can't remember for sure or where I think I saw them. Just an idea of another thing to try out.
Just found them while typing this. altsmoke is where I saw LR 901 attys. However, it says not to use on stock 901 batteries... so that idea is out for now.
As for using the cartos on a 901, that will give you a lot more juice capacity. A LOT more. You'll notice a big improvement there. You can find those adapters in a lot of places. Altsmoke and a few others all have them.
There is a thread up top of this forum with soldering tips, it helped me out a lot.. but I still can't do a clean solder job all of mine end up wicked messy with too much solder... You may have better hands than I do though.
Just found them while typing this. altsmoke is where I saw LR 901 attys. However, it says not to use on stock 901 batteries... so that idea is out for now.
As for using the cartos on a 901, that will give you a lot more juice capacity. A LOT more. You'll notice a big improvement there. You can find those adapters in a lot of places. Altsmoke and a few others all have them.
There is a thread up top of this forum with soldering tips, it helped me out a lot.. but I still can't do a clean solder job all of mine end up wicked messy with too much solder... You may have better hands than I do though.