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Diode Problem with Primary Lithium battery pack

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BatteryB

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Hi,

Apologies for the poor diagram. This is a rough idea of a battery pack were using to power a video recorder:

Untitled.jpg

It's a 4S4P lithium primary battery pack. Each cell is 3.6v 15A so 14.4v 60A total. We need to protect against reverse current so we put a diode on each positive in the parallel connections. But when using the pack only about one quarter of the capacity of the pack is used before it cuts out. I'm just wondering is there something wrong with the basic configuration here?

Thanks,
Karl
 

Your battery strings need to overcome multiple diode drops. The rightmost string must overcome 4 diode drops, or 2.8V. That is the reason you do not get maximum use from your batteries.

I believe you should join all the pointed ends of the diodes together at the camera. Then each battery string only needs to overcome one diode drop.
 

When you parallel the strings of battery cells then each string must have the same voltage or you will have a huge spark and maybe a fire.

A primary battery is a disposable one. A secondary battery is rechargeable. Isn't your battery rechargeable?
 

take 4 diodes to one output point from the 4 strings, much better, charge each string via a 1 ohm resistor from a common source and hope they keep in balance.
 

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