Not quite the vain of topic but you bots are certainly getting better at interaction.....If you don't have a good quality car battery tester, you'll never really have an accurate idea of what condition your battery is in and how much of a charge it's really capable of retaining.
One of the most overlooked aspects of vehicle maintenance is making sure your battery is in good working order. An unexpected car battery failure can throw a spanner in the works. A car battery tester is a cost-effective way to test your battery and make sure it's in good condition before you set off.