I work at Screwfix......there got it off my chest
The first step is admitting you have a problem

the Makita drill you are looking at is very good for the non-professional and at the moment it is a very good price.We don't get to see many come back which is a good sign for reliability plus as it is a reputable brand you know you will be able to get spares for it in the future.When looking for a good cordless drill it is not the voltage of the battery to look for but the Amp Hours (Ah).The bigger the better.As someone has allready said there are now drills that come with li-ion batteries and they are higher power than this but they do come at a price.I hope that helps 
I received the Bosch LI-ION Screwdriver (GSR 10.8 V-LI) a couple of years ago for Christmas - It is a great bit of kit
- Light weight
- Compact
- Fantastic battery charge retention *
* - power tool manufactures are phasing out Ni-Cd (already very obsolete by IT standards) for Ni-MH which are being pushed as mainstream - Li-ION has now been introduced as the next generation for the industry ( although standard in laptop's for at least 5 years)
However, if you are buying the drill/driver for this one small job - buy cheap & cheerful- ~£30 - £40 max - use and dump when it dies