why have you S+85DLC03DI SFP+ modules ?
The correct PN is S+85DLC03D, whitout "I".
"I" version have less distance capacity and other shortcomings.
Exactly !! 12V is a good compromise for costs and size of battery.That 12V battery should work. We also have some products that can be powered from USB (5V) but those are smaller indoor units (mAP lite, hAP lite)