Well to clear up a couple things first RNB said you can use LI-ION until they are dead, well if you did they would never charge again. They have a cut off voltage on protected cells, non-protected go below that and good luck, second neither even brought up the protected mode board for the cells, if you use a smart charger then you only need either protected cells that cut off at a pre-determined voltage or a PCB board. Otherwise you run the risk of discharging the batteries to much, yes norbyx the buzzer was a nice touch but if you don't hear it on a windy day with headphones well to bad go bye another cheap battery pack. Not sure what the RNB has in it, TDI has a PCB board on the Pro and TDI. I wouldn't use LI-PO on any unit I would sale as its not safe you don't know how people will use it. LI-ION explode also so you have to be careful with them. But for yourself if you know the risks its your detector. And having worked with RC stuff and detectors for years as far as batteries go you get what you pay for. Like REG said most Li-Po or Li-Ion from China are junk fake cells with over reported mah some go so far as to hide tiny 800mah cells inside 18650 and call them 5000mah cells.
Last everyone should use the others knowledge if they are wise not just piss each other off, there was a lot of knowledge thrown around in these posts that could be useful to all. Never diss a product you haven't tried I know a lot of people that love the RNB packs, they couldn't solder a wire to anything so building your own is out of the question for them, so that is the spot that RNB fills not the DIY like norbyx or me for that matter. So to sum it up your all right pretty much just different opinions on how to go about it.
Another thing that bothers me is everyone keeps calling these 12 volt packs. There is no such thing as a 12 volt Li-Ion or Lipo pack, there all based on either 3.6 cells or 3.7 cells so its either 10.8 or 11.1 they will charge up to 12.6 or so but there still not 12 volt batteries as this voltage will drop in a hurry, it also was different to make one of these packs for a V3 and one for the TDI sl the V3 doesn't use near the amps the SL does and might last all day, but I can tell you the Tenergy aren't going to last all day in the SL I have used their cells in RC cars and they are always over reported on their actual MAH. I doubt you will get an hour with one of those packs. If your going to all the trouble making a pack at least use quality batteries.
