John Sessoms wrote:
From: mike wilson
My understanding is that "dry" (ie gel, glass mat and all the other
sorts) lead-acid cells require greater currents for charging than the
plain vanilla version. You may want to do some serious research
before taking the plunge. FWIW it seems likely that the cells would
not charge if the circuitry was inadequate, rather than some damage
being done to the electronics.
Looking into it further, the existing battery is made up from 3-2V 2.5ah
glass mat cells (sealed lead acid) series-ed together to make the 6V
battery. They're the size of D-cell disposables, but have connection
tabs on the top.
http://www.enersysreservepower.com/scpf.asp?routine=scpf
What you're saying is ... *IF* I substitute 3-2V 4.5ah cells it might
not charge quite as efficiently, but the risk of actually damaging the
charger is low?
And a gel cell is just a different way of sealing the electrolyte into
the battery, i.e. gelled rather than glass mat. They're both sealed lead
acid batteries and have similar charging characteristics.
Similar enough that the risk to the electronics is minimal?
I understand that if I try this and it doesn't work, *I* am the one who
is screwing it up.
Again _my understanding_ is that, because of the construction, these
types of batteries _require_ a higher current to initiate charging, so
they wouldn't charge at all if an ordinary charger was used. At least,
that's what the companies that produce chargers for them say.....
But all of my "knowledge" applies to batteries that are for motor
vehicles and produce a lot more power than the ones you are using. They
certainly could not be charged by wall warts. Generally, wall warts are
such simple devices that they could indeed be damaged by an excessive
current requirement although the low cost of replacement would not make
this too much of a problem.
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