Do what you want, just be aware that you won't find a

**100** amp-hour 6 volt battery, which makes your interpretation moot. 6 volt batteries are typically

**200** amp-hours each, meaning a pair wired in series will deliver 200 amp-hours at 12 volts.

Here are a couple of practical examples from the same source (Batteries Plus, a nationwide chain of battery stores).

First, a pair of 6 volt GC-2 deep cycle batteries:

Duracell GC-2 Golf Cart BatteryAt $99 each, two six volt batteries will cost $198 for 12 volts, 225 amp-hours of storage. That's 88 cents per amp-hour.

Next, a 12 volt, 105 amp-hour deep-cycle battery of the same brand, from the same source:

Duracell Group 31M 12 Volt Deep Cycle BatteryAt $130 for 12 volts, 105 amp-hours of storage, it costs $1.24 per amp-hour. While one of these batteries is three times as much storage as your present 12 volt, 35 amp-hour battery, you'll need two of these to approximately equal the capacity of a pair of 6 volt GC-2 batteries.

Your present battery is 12 volts at 35 amp-hours:

Duracell 12 volt 35 amp-hour batteryAt 35 amp-hours of storage, it's considerably smaller than either of the above examples. You'll need 6 of these to get the same performance as a pair of golf cart batteries, or 3 to equal the single 12 volt, 105 amp-hour battery. At $90 for 35 amp-hours, it has a cost of $2.57 per amp-hour.

But note this is a maintenance free, sealed AGM battery. The other examples are wet cell batteries, which require venting and occasionally replenishing the water levels.

The physical size and weight may also be a consideration. The 35 amp-hour battery is 7.67"L x 5.13"H x 7.09" D and weighs 20 lbs. Both the golf cart batteries and the 31M 12 volt batteries are considerably larger and heavier than this.

I hope this helps in your decision.