12v battery question for any battery experts!

[pegasus bridge]

i have been given a couple if yuasa (?) 12v batteries - i have connected one to a flapper and it works fine (well - tested it for a minute) - but it states on the side 'designed for standby use' ; (they are marked 12v 7ah as well)

 

will this be ok to use to power a flapper? can i charge them using a standard charger?

[steve_b_wales]

It should be okay, and will last you many hours when connected to the flapper. You should also ba able to use a 'standard' battery charger as well.

[Lez325]

If you wire them in series ( + to + and - to -) you'll have a 12v x 14Ah battery - last a lot longer-m the battery you have are designed for stand by systems such as fire alarm panels etc- but will be up for the job you intend to use them for

 

Les

Edited January 16, 2010 by Lez325

[pegasus bridge]

cheers Gents - will they be any use on the lamp? or is that too thirsty a use for them?

[John_R]

If you wire them in series ( + to + and - to -) you'll have a 12v x 14Ah battery

 

Les

 

That is wiring in parallel. Series would be - to + resulting in 24 volts.

[chubbs45]

the yuasa 12v 7ah are nearly all sealed batteries so a normal/standard charger will just burn them out really quickly although it will charge them , either use a gel charger or a sealed battery charger on a low charge setting and it will make your batteries last loads more . (not in usage but in longevity ) hope this helps .

 

chubbs :(

[robkmx]

i have the same batery and i use it for lamping it lasts me for 2 nights there really good batreys

[wabbitbosher]

That is wiring in parallel. Series would be - to + resulting in 24 volts.

 

 

You beat me too it

 

You can charge them in parallel too your less likley to fry them

 

Just to recap +ve to +ve and -ve to -ve is Parallel

[chunkyed]

My mate SSS has one for his lamp I think, it seems pretty good and i imagine it will be fine

[mcw65]

They do them up to 30A.Find a electrician who has a fire alarm contract as they have to be replaced when out of date and they throw them away even though there is nothing wrong with them.

[Lez325]

That is wiring in parallel. Series would be - to + resulting in 24 volts.

 

 

Fair enough - I know what I meant lol + to + and - to -

 

Les

[activeviii]

if its for a flapper from shootwarehouse then a 7amp will last a long time as it was a 3.2amp that came with my flapper. i use the pinewood rotary and that comes with a 7amp which gives me around 5hours use on full whack. i have a 12 and 17amp that i use for the summer and for lamping.

 

the cheapest 17amp was from aldi, i there power packs. £24 for the power pack and just strip the battery out, comes with mains and car charger as well.

 

 

Phil.

[killer rabbit (r1000)]

:o in my experience these are among the best of small sla batteries - i use them a lot myself, for the one you have you only need a small sla charger (these can be found at most electronic specialists, or even take the charger from some of those "kids" motorised buggies), don't try to charge it from a car or motorcycle charger (unless you have more than one connected in parallell), as it will get rather warm & won't last long (it may even present a fire hazard). the "designed for standby use" label means simply that it will keep the charge for much longer than other types when not in use.