Yes. Just make sure it's < 6V and can provide at least 1 amp.
As long as the normal "only use 80% of battery amps" rule is adhered to.
Question for you guys! Not sure where to ask this but I have a 2.6 apm/gps/compass/osd/telem.... I also use the apm 5.v power module. I noticed since I added the osd I have brownout that ends in a flip of death! I have read others having the same issue with random parts with all these items plugged in. By adding the osd does it max out the bec or something like this?
I tried another osd unit and same thing. But when not plugged in it's fine.
I took the telemetry unit off left the osd plugged in and worked fine as well!
My next step is just to add a bec and power the osd on it's own. My last ditch effort to fix my problem. I noticed there is a diode added on my 2.6 board not found in eagle files everyone is always showing! Everyone calls it a mistery part.... But it's not it's a diode and I'm leaning toward this part being the cause!