Gel Batteries don't do well in the cold.  Trickle chargers, usually  state 
that they are not for GEL batteries.
Better to bring the batteries indoors and charge once a week, overnite with 
 a 12 volt charger at 3 but no more than 5 amps.
Additionally, a gel type battery can lose up to 1% of its total energy  
every 24 hours if not charged.  This, to me, implies that at the end of 7  day 
you have lost 7% of  about 13.5 volts.  You could alternate the  use of the 
charger, every weekend.
 
I hope this helps.
Best Wishes
 
 
In a message dated 1/8/2015 3:55:04 P.M. Central Standard Time,  
[email protected] writes:

 
I have a new wheelchair, but I would like to keep my old  Invacare 
wheelchair as a spare. I live in the Washington DC area (it gets  below 
freezing in 
winter) and I am hoping to store my old wheelchair outside  in a shed. I 
have been told that I need something called a "trickle charger"  to maintain 
the batteries.  
I do not have power in my shed, and so I have been  considering solar 
trickle chargers. The majority of trickle chargers I have  found online are 12 
V 
but I think I need a 24 V trickle charger with an XLR3  connector. 
Have any of you done something like this before? Do you  have any 
recommended solutions or vendors? Can I use my existing charger on  some sort 
of a 
scheduled basis to maintain the batteries  safely? 
Thanks so very much, 
Dave Krehbiel 
(301)924-4530

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