I have an Hitachi DV18DVC drill with 3 batteries and they are all knackered. Drill is about 5 years old but has had little use. The batteries barely hold a charge. I've seen replacements batteries and they are around £35+ each. Recently there was an offer someone posted on here for a Bosch lithium ion cordless with 2 batteries for £65. I'm thinking I'd be better with something like this as li-ion batteries don't tend to suffer as much with infrequent use. So similar cost and get a new drill. Is that good logic for self justification?