I have a Draper "Intelligent Battery Charger" which I got from a motor factors for about £30, it's self-adjusting and monitors the charge state of the battery and when it's fully charged the green LED comes on and it goes over to trickle mode.
I also have a (Lucas) 75ah leisure battery and that usually allows me to charge 4-5 6000mah Turnigy nanotechs from a full charge, when the battery voltage goes below 11v the LiPo charger stops working and I have to revert to mains power. I'm sure it used to do more than this when it was new in January but I got it tested the other day at a tyre and exhaust place and they said it's a good battery.
I'd be interested to hear how your Lumax battery performs in comparison as it's the same capacity.
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