Once there were three little lithium cells..


They were in their little holders all snug, and connected in parallel.

One day, the evil user replaced the cells, and put one in backwards.
Chaos ensued.


So, I'm looking for a solution for protecting my system against
reverse insertion of the cells.
Mechanical means are out, there isn't a holder that will work for me
that can't be reversed.
(trust me, I've looked a lot)

I know I can use mosfets to achieve this, but I have an additional
problem.
The load is too large to be on one or two cells, and having the system
power up with only one or two inserted right would be a bad thing for
several reasons.

No, I can't put them in series, other reasons... :(

So, is there a solution with four mosfets that will effect a bridge
rectifier, that won't eat me alive in I^2R losses, so I can have the
user insert the cells any which way, and it still works?

Cost is not a major concern.

.

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