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Andy,

Depends what you want them for. I use a couple of the Maplin 1.5 watt ones just to keep the batteries topped up in the winter, probably totally unnecessary if the batteries are in good nick. These deliver about 18mA into a fully charged battery on a dull day, roughly if my maths are correct about 1A/Hr a week in the winter (don't work too well at night although they do respond to Richo's flood light Hope Clive doesn't read this or he will put up the rent.) If you want do anything other than maintain full condition of your battery you will need something with an output in terms of amps not miliamps. If your batterys are not maintaining their charge with nothing drawing any current you may be better off spending your hard earned on new batts

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