SLA batteries opinions?

On Tuesday, April 3, 2018 at 1:51:03 AM UTC-4, wrote:
... Have fried more than one battery when the charger did not detect peak and shut of (Or float) before the battery got hot.

Yes any time the battery gets hot it's bad for it. I've had batteries get hot sometimes when using a supposedly "smart" charger that was too small. Such a charger maintains a constant current until the voltage rises to something like 14.5V, and with too small a charge current relative to the size of the battery that may never happen. Alternatively the problem may be in the second stage, when the charger maintains a fairly high constant voltage and looks for the current to drop to, say, 5% of its capacity - with a 0.7A charger and a 12AH battery that may never happen. Sometimes I use a "dumb" charger that maintains a constant voltage of about 14V, that's safe (for a couple of days) but slow.

On Monday, April 2, 2018 at 1:14:19 PM UTC-4, john firth wrote:
Recently I tested two 12v SLA s which had been in use
sequentially for some years usually recharged before going
going flat, or at least within one day.
Both were run down to 10.5 v with a 10 ohm load and then recharged to 14v,

The Yuasa 7 AH bought 2005 was good for about 2.5 AH
the UB 1280 8AH 6 years old good for 2AH.
On this showing the Yuasa look like the better battery.
Both were used as panel supplies running at .5 A load.

Any opinions on competing SLA batteries?

John

The specs on the Dakota 12v 10 ah ($99) bats look good
Any experiences?

JMF

On Wednesday, April 4, 2018 at 11:24:19 AM UTC-7, john firth wrote:
On Monday, April 2, 2018 at 1:14:19 PM UTC-4, john firth wrote:
Recently I tested two 12v SLA s which had been in use
sequentially for some years usually recharged before going
going flat, or at least within one day.
Both were run down to 10.5 v with a 10 ohm load and then recharged to 14v,

The Yuasa 7 AH bought 2005 was good for about 2.5 AH
the UB 1280 8AH 6 years old good for 2AH.
On this showing the Yuasa look like the better battery.
Both were used as panel supplies running at .5 A load.

Any opinions on competing SLA batteries?

John

The specs on the Dakota 12v 10 ah ($99) bats look good
Any experiences?

JMF

They are like all the 10Ah Chinese LiFePO4 batteries.
They Claim 10Amp but when tested with deliver 8 or 9 aH.

I just tested 2 K2 12V10Ah batteries for a customer use for several years. Tests results with a West Mountain Radio CBA IV 7.3 aH and 8.5 aH. My conclusion is they are not any better than the $99 12V9Ah batteries

Richard
www.craggyaero.com