Discussion in 'Electronic Basics' started by Harry Muscle, Dec 5, 2003.

1. ### Harry MuscleGuest

AH stands for Amp Hours, so you could draw 4.5 Amps for 1 hour or 9 Amps for
half an hour, etc.

Harry

2. ### JifGuest

hi

i have 4 batteries (identical) 6v / 4.5AH

if i connect them (parallel or series)
do i get the total volts and ampere (6V x 4 =24V) or (4.5Amp x 4=18Amp)

btw: it is writen 4.5AH for ampers, what is the AH stand for and means

deep thanks

jif

3. ### Keith R. WilliamsGuest

AH == Ampere*Hours Thus, a 4.5AH battery will supply 4.5A for one hour
or 1A for 4.5H, or there abouts (the discharge curve isn't linear).

4. ### Walter HarleyGuest

AH is amp-hours: it is a measure of how much energy the battery stores. A
4.5AH battery will supply 4.5 amperes for one hour before discharging; or 1A
for 4.5hrs; or 3A for 1.5hrs; you get the picture. It's an approximation;
often the amount of current you draw affects the battery's efficiency. So
it really means "4.5AH at the optimal discharge rate, and less otherwise."

The actual amount of current the battery can provide is determined by its
internal impedance. Could be 100A, could be 0.1A, no way to know from your
description.

If you put batteries in series, the voltage adds, but the current capability
(that is, the actual amount of current the battery can provide) is
unchanged.

If you put batteries in parallel, the voltage is unchanged, but the current
capability adds, at least within the limits of how much current the wiring
and the connectors can handle.

Regardless of how they're hooked up, the energy capacity (AH) of each
individual battery is unchanged. So, if you hook four in parallel, you've
got a 6v 18AH battery.

5. ### Boris MoharGuest

There is a difference.