Asked — Edited
Due to being disoperational for over a year, my omnibot's battery has died.
Does anybody know a good replacement? The dead one is a 6V 4Ah lead-acid with this form factor:
Does anybody know a good replacement that's not too expensive and has the same or a smaller form factor?
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What are my options? I'm considering Lipo's but they need a seperate charging and protection circuit.
Li-Poly are only problematic while charging. If you use a decent balance charger you should have no problems, provided you don't try to charge at more than the rated C value. There is a lot of info on Li-Poly on the internet, ignore the paranoid information about fire etc. use it right and it's perfectly safe. Just be aware of under voltage, you would want a decent low voltage alarm system in place.
A 2S Li-Poly battery is 8.4v when fully charged but throw in a regulator and make it 6v and it'll run perfectly (or run at 8.4v, I do)
Pretty much any battery type will be better than a SLA. It will all come down to funds available.
With very little modification to the battery area you should be able to fit 2 5000mAh 2s Li-Poly batteries in.
Running a 11.1V 1500mAH I'm using on my Omnibots. It runs fine but I think I will bump up to a
higher mAH for a longer run time or double up on (2) 2200mAH.
Cheap and seem to work fine.