Isnt there a way to just wire two batteries at 12 (14.4) together in series or parallel or sonething and then the voltage is double instead ofthe current? How would i go about doing that?
A pair of 12V SLAs wired in series would only be about 24-25V, and even less under load. Five large 6V SLAs might work better. Some of us are simply using many NiMH or Lipo/Emoli/etc. cells in series. The general idea is using 24 NiMHs, or possibly 25 or 26, or 8 (possibly 9) Lipos to reach the specified 28V and hopefully a few volts over to get better output.
From the Welcome Mat:
Q: What are series and parallel?
A: Series connections have a device's positive terminal connected to the next device's negative terminal. This is what you get when you line up some ordinary C-cell alkalines (for example) end-to-end, like in a Maglite or other flashlight. This arrangment adds up the voltages of the cells. Such a battery neither handles more current nor contains more mAh capacity than a single cell. This is the opposite of a parallel configuration, which has positive terminals joining together and negative terminals joining together. An example is those 3AA>1D adapters where all three AA cells' positive terminals meet at the top, and all their negative terminals meet at the bottom. Such a configuration has the same voltage as a single cell, but can handle more current draw (or contains more capacity). For example, 1AA alk can push about 500mA at around 1.5V for about four hours. 2AA alks in series can push 500mA at around 3V for about four hours. 2AA alks in parallel can push 1000mA at around 1.5V for about four hours (or 500mA for eight hours, and so on).
Also from the Welcome Mat:
Q: What does "overdriving" mean?
A: Every incandescent bulb has a rated nominal voltage, which is basically the manufacturer recommended driving voltage. A bulb connected to a lower-voltage source than is recommended with have weaker and more orange-tinted output, but it will have increased durability and lifetime. A bulb driven above spec will have whiter output, but decreased durability and lifetime. A given bulb's efficiency actually increases along with drive level.