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Charge a 6V Battery with 12V PulseTech Chargers

PulseTech XC100-P

Over in the online store today, a customer posted a question about PulseTech products. If you read our last post about PulseTech and battery care, you already know how beneficial PulseTech products are for extending the life of your lead-acid batteries. But what if you want to enjoy the benefits of pulse charging for a 6V battery? Browsing through our selection of PulseTech products turns up a bunch of 12V chargers, and on-board conditioners for 12, 24, 36, and 48V batteries, but no 6V chargers.

Visitor Arrnold asked if we carried 6V PulseTech products, and the answer is no. PulseTech doesn’t make 6V chargers. It seems unfair, but there’s a manufacturer-sanctioned workaround: If you connect two 6V batteries in series, your charger sees them as a 12V battery, so you can use any PulseTech product you want! According to PulseTech’s FAQ:

Although all of our products are designed for 12-volt systems, application of Pulse Technology on 6-volt batteries can be achieved through series connection of 6 volt batteries creating a 12-, 24-, 36- or 48-volt system. Product use is dependent on final overall system voltage.

OK, so they said it can be done, but it’s not the most user-friendly explanation if you don’t already know how to connect batteries in series. So, we’ve created a simple diagram showing how to connect either two or four 6V batteries together, to create a 12V battery bank. But first, a couple basic things to remember:

  1. When you connect batteries in series it multiplies the voltage of the resulting battery bank. Two 6V batteries in series make a 12V battery bank (four 6V batteries in series create a 24V battery bank, and so on).
  2. When you connect batteries in parallel you multiply the Amp hour capacity of the resulting battery bank, but the voltage stays the same. So, two 6V 100Ah batteries connected in parallel creates a 6V 200Ah battery bank (which your PulseTech can’t charge), but if you make two “series pairs” and connect each pair in parallel, you have created a battery bank with double Ah capacity and double voltage, which your 12V PulseTech can charge!

Because all PulseTech products are available in 12V models, that is what we’ve used as the output in the diagrams.

series and parallel battery connections

In the above picture, the green ‘cables’ show where the batteries are connected to create a 12V “series pair”, while the black & red ‘cables’ show where your 12V charger connects to the battery bank, and also how to connect multiple “series pairs” in parallel (to charge 4 or more batteries at once). Once everything is hooked up properly, you can turn your charger on, and enjoy the benefits of pulse charging for your 6V batteries!

As you can see, if you only want to charge two 6V batteries, it’s quite simple. Connect the positive terminal of one battery to the negative terminal of the second. Then connect the remaining two terminals to the corresponding charger cables (positive to positive, negative to negative). This creates a 12V battery bank with the same Amp hour capacity as the individual 6V batteries.

If you want to charge 4 6V batteries with a 12V charger, you need to connect them first in 12V pairs (like the first example), and then the other four terminals need to be connected in matching pairs. Connect both remaining negative terminals together, and then do the same for the remaining two positive terminals. Then connect your charger to one end of each “parallel chain” (positive to positive, negative to negative). This creates a 12V battery bank with twice the Amp hour capacity of the individual 6V batteries.

We hope this post has been helpful for those of you out there who use 6V batteries, and would like to enjoy the benefits of PulseTech’s patented charging & conditioning technology! If you have any questions about this post, drop by our Contact Us page and let us know.