Plugging two chargers into 12v SLA

[cubfanatic]

Does anyone know if it is possible to plug two chargers into one 12v lead acid battery?

I could buy another 12v battery but they are very heavy to carry two around, if anyone has done this before could you let me know?
Thanks very much

[larkshead]

That should be no problem, other than draining the battery faster.

Regards,
-Peter

[flydiver]

If it's a car size battery - no.
If it's a smaller appliance type it may not handle it well.
Check the amps.

Remember you are pulling AMPS. Car batteries are like 50 amp-hours.
A single Cub lipo is 1300milliamps = 1.3 amps.
Even a 2200 is only 2.2A.
You can fill a LOT of ordinary lipos with a car battery in decent condition.

[cubfanatic]

Thanks for your replies!
My 12v battery is 7amps so say if I recharge 2 1.3A battery's (2.6A)
And two 1.8A battery's (3.6A)
This leaves only 0.8A left in the battery, is this safe? Will it harm the battery?
Thanks again

[flydiver]

Yep, surefire ruination.
Figure about a 20% loss for charging inefficiency and throw in that lead-acid hates being discharged deeply.
So you are pushing that one to the brink.
By guesstimate I don't think I'd pull more than 5A out of it, 4 would be safer. You can maybe do 2-3 of those lipos, depending on the actual condition and charge of the 7A unit.

Figure NO rechargeable of any sort likes deep discharge-not even NiCad on a routine basis. Some like SLA and lipo are worse about that characteristic.

[cubfanatic]

Oh ok, my battery is only about 3 moths old and the most I have drawn out of it at one time is about 2.6A.
I just brought a new plane and was going to charge the battery's for both of them at once.
So I clearly need to learn more about battery's and AMPS and such like.
I appreciate your advice, you just saved my battery from its death!

Chris

[flydiver]

Here's a thread on another forum that goes into a lot more detail. Take some time with it and you may understand a bunch more.

www.rcgroups.com/forums/showthread.php?t=1684523