I must be falling asleep, doing DIY every spare minute.

For about £119-129 you can get a heavy duty Makita with 2x 2.6Ah NiMH.
Most DIYers avoid NiMH because of the self-discharge (flat when you
need them), but battery capacity 2.0Ah is very welcome if you need it
- waiting for piddling 1.3Ah batteries to recharge gets "old" after a
time particularly when you are down to two or one of them.

To get 2x 3.0Ah NiMH or L-Ion you are into £220-280, so the above is
very good value. Whatever, get a 13mm chuck if possible because the
small ones can be frustrating and converting quite expensive.