The Weakest Link

Post date: Jul 14, 2011 9:47:12 PM

In a series setup (4, 12V batteries making a 48V string for example), the capacity of the system is governed by the weakest battery in it. It can be difficult to find them - they often charge to the same voltage as their stronger brethren. But one way I've found pretty reliable is to use a high-wattage battery tester (like this one ) on each battery in the string, while it's already under load from the drive system (I run mine at 40amps). The weak battery should be very obvious at that point.