ORIGINAL: HarryC
ORIGINAL: olnico
On that matter I recommend the Graupner ultra Duo 50 + charger. It is able to display the charge and discharge internal resistance for each element of the pack and log it into its internal memory. So you can track the evolution of your battery health with the time.
Oli, do you know of any other much cheaper, simpler device that can do the internal resistance check? I have a workshop full of chargers and won't spend another huge amount for the Graupner Duo!
H.
You can use the ESR meter from Bob Parker:
http://www.flippers.com/catalog/index.php?cPath=3
It is sold as a kit.