@jaychadw why would you use a car battery battery,first very heavy ,but second it very dangerous ,car acid leaking

Also about DC-DC converters they are not great for robotics ,there is a lot of guys here that use them because just attach 4 wires and you are done.

But they have a few problems one the mostly big,but main item you lose battery life (current)

Best item and easy to use is the same used in EZB LDO (LOW DROP REGULATOR) it saves a lot of battery life low drop voltage. (can expain it better if you need it) 3 terminals gnd ,V-IN ,v-out, and stays very well regulated

I am electronic enginner who designs battery power equipment,if you look at any battery power toy,design or tester or anything the uses batteries not one will use a DC-DC converter

What kind of batteries do you put in your car?!.. Car batteries aren't prone to leaking acid, they haven't been for a long time since you no longer need to top them up. A typical 12 battery is 17Kgs but gives 70,000mAh for the cost of 3 2S 5000mAh LiPo batteries. There are many reasons why one may be used. Not every robot is mobile either...

YES i i know ,only asked the question just to see what he was using in for i seen others using car batteries for robots and they had problems with it,,fumes and very heavy

HIS design might be for his car,or mobile only he can answer it

Leaky car battery not a real problem mostly when you try to charge it and fumes problems

one of the best batteries is GELL CELL is sealed,very few problems using it,kinda heavy depending on th AH rating 17kg is 37 lbs

ON GELL CELL you can put on any side and not have a problem,second on the high current of a car battery it not needed ,unless you are make a EZB car ,with i have seen designs using it .but with a laptop and a lot of sensors

second to charge a car battery it takes a good sizeable charger

@RobotMaker it is going to a fairly large mobile robot. It us going to use a large number of powerful motors. The points you raised on weight and recharge are the very same things that concern me. I need to provide the power for all motors as well as try to maintain a decent battery life without the need to recharge every hour or so. I am more of a software developer and used to play around with animatronics some ten years ago. The things I did before were always connected to mains but that is in no way an option for this. I just figured for these reasons a small car battery would be ideal. If you have any suggestions for running ten strong motors I would more than pleased to hear them. I am focusing on shall we say a mobile domestic robot. So mobility is essential.

@robotmaker I am interested in what you said here "Best item and easy to use is the same used in EZB LDO (LOW DROP REGULATOR) it saves a lot of battery life low drop voltage. (can expain it better if you need it) 3 terminals gnd ,V-IN ,v-out, and stays very well regulated"

LDO is very cheap and depends on current is needed,what is meens if you have a battery with 12 volts outs and using a LDO dropout voltage is about .2 volts or less on dc-dc or other regulators is about 1.25 volts

So the battery will last about twice as long before recharge ,now even with high current motors still can easy use LDO,nmight need one per motor

ON battery how many motors are you using and the run current (not stall current) and then about how many hours do going to use them.