- Current limiting is essential and voltage control is too. I would not wander too far above 16.0 volts as heating rises exponentially
- NAPA AUTO PARTS carries 25, 50, 75. and 100 watt TWELVE VOLT SCREW IN LIGHT BULBS
- Here's another eBay way of doing it.
https://i.ebayimg.com/images/g/twkAAOSwxXJcwqyS/s-l1600.jpgI choose the 100 watt size to limit the heat expended and the resistor is physically larger and tougher.2.0 ohms = 6.0 amps @ 12volts
0.5 ohms = 12.0 amps @ 6 volts.Why so many amps? Golf car batteries are higher capacity at half the voltage.
If you have an unregulated battery charger put ANOTHER resistor in SERIES with the first one. An assortment of primary resistors noted.
The formula of roughly 5% or 10% current can be daunting to newbies. Simply inquire by asking "I am equalizing a pair of (BCI group size) batteries with THIS charger, so what power resistor do I use? It's an all or nothing deal when choosing a resistor. So all of the info is needed. Be prepared. There can be no guesswork at deriving at the correct resistor for the job.
These resistors used-to-be expensive. Now they are dirt cheap, small, and tough).
I much recommend equalizing batteries one-at-a-time
