new 8 H internal battery :

shows 5.5 V to 5.3 V work with 8 hours.

default weaning value is 5.2 V.

only 0.2 to 0.3 V goes to loss.

this is new low power loss operation circuit.

original use 9 V battery, 7,2 V battery or high voltage like 15 V battery shows that voltage and work no problem with IBVA. However this way is more high power loss operation.

this way 9 V - 5.2 V = 3.8 V,  7.2 V - 5.2 V = 2 V, 15 V - 5.2 V = 9.8 V power loss.

this voltage difference goes to heat.