Gel batteries require a theoretical constant voltage charge. They are not tolerant of overcharging unlike a wet type. However many modern chargers can do both - you just need to check the spec. And make sure it does mention gel rather than sealed.
I'm not surprised an original dedicated charger costs much much more than a generic suitable one. Exactly the same applies to laptops, etc.
Yes! Voltage is different. This matters, otherwise you'll reduce the lifetime of your gel batteries.
Unfortunately the cheap wall-wart gel chargers are too low output current to charge a wheelchair in a useful time. Best approach is to either build (DIY or kit, chipsets are easy and widespread) or find a hefty car charger and then play with the output regulation.
Ideally all lead acid batteries require constant voltage charging. Gel batteries are just more sensitive to gassing and subsequent loss of electrolyte through "over" or prolonged charging.
Most wheelchairs use two batteries in series to give 24V. 24V sealed lead acid chargers are less common and hence more expensive. The wheelchair ones tend to be quite complex as well.
This is actually a *clip on* 12V motorised wheel fitted to a standard chair.
The Battery is horizontal in use so it is certainly sealed. I am not
100% sure about the gel bit.
I have found an outlet supplying batteries and chargers for golf trollies which comes at £35.00 and claims to be suitable for GEL and AGM whatever that is. The connector is *Torberry* which should fit.
The purpose is to lend the kit to a friend. I know I should be creating one from dead microwave ovens etc. but life is currently too short:-)
Major c*ck up on ordering the charger... Sage Pay took me through the procedure for Barclaycard secure online purchase but, after entering my password, appeared to lock me out with a *page unobtainable* message.
I assumed the order had not gone through and re-ordered using a different card. You guessed it, two confirmation mails!
Brand name Optima. Over hyped and over priced. They boast in their advertising that they last longer than a standard battery, but only offer a warranty poorer than many of those.
Oh indeed. Cars too, come to that. The lovely little Lidl/Aldi charger at about 13 quid will cost you 3 times that from a car place. And a 'maintenance' only one - just a low current wall wart in essence - about the same.
We were somewhere around Barstow, on the edge of the desert, when the drugs began to take hold. I remember "Dave Plowman (News)" saying something like:
I must add another recommendation for the Lidl charger - one of mine developed a worrying bulge and stopped working (I'd been sorely abusing it). The kompernasse agent sent a mailing sticker and a week later I had a brand-new replacement under warranty. I kept the croc-clips from the old one as I quite like them.
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