PICers,

I have a battery operated camera that uses a 1.5Ahr 12V gel battery. I
found it was too puny for the job so I made an auxilliary power power
pack with 2 x 7.5Ahr 12V gel batteries in parallel (overkill).

The arrangement looks like so ((switches, fuses etc not shown) :-


----------------------------------------------------------------------
------------------------------------
             |                                |
|                         |
    Battery_ 1(7.5Ahr)      Battery_2(7.5Ahr)
Battery_0(1.5Ahr)          LOAD
             |                                |
|                         |
          GND                          GND
GND                  GND

OK, the gizmo works but the 1.5Ahr battery still drops dead when I
switch out Battery_1 & Battery_2. It falls down to around 3.5V! (B! &
B2 are OK) I figured B_1 & B_2 would "top up" B_0 during operation and
all would be well.

Is there something I'm not figuring here? Does this arrangement *have*
to have batteries whose capacities are all equal?

Thanx for advice - Ian.


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