12V 18AH SEALED LEAD ACID BATTERY

CAT# GC-217
$59.00 each
Quantity:  
 
7.12" x 3" x 6.7" high.
Average Customer Review:  (17 Reviews) Write A Review

Customer Comments

Average Customer Review:  (17 Reviews) Write A Review

A customer from Ventura, CA
50/50 Good News/Bad News
Out of two of these, one of em runs *perfectly*, the other one isn't quite up to specs, here's how it breaks down: 17aH @12vdc is supposed to mean that this battery will supply a 1 amp @ 12v load for 17hrs. I'm using these batteries for backup lighting, (since Edison is SOOO reliable...NOT!)
With a common 300 watt cont inverter and a single 42 watt compact fluorescent. Actually the Phillips bulb is rated 375 mA at 120 VAC - the inverter hooked up to either one of these batteries (fully charged) gives me about 95-110 vac output. Translating this power requirement to 12 vdc is 42watts/12vdc=3.5amps And: 17aH/3.5 amps = 4.857 hrs Now my inverter is over 90% efficient, but assuming 90% overall, that means I should get a runtime of around 4.5 hrs. Well SURPRISE! One of these cells will consistantly run the bulb for 6.5 hrs between charges, whereas the other is lucky to make it to 2hrs 10mins! QUALITY CONTROL in action! Guardian is not what I would call a "First Rate" battery company, but their prices are a heck of a lot lower than Optima! ;) Your mileage may vary.

A customer from Fredericksburg, VA
Re: "Max Amps"
The 17ah capacity of the battery is normally based on a five-hour discharge rate. You should be able to draw 3.4 amps for five hours under ideal conditions.(3.4 X 5 = 17) The real world performance will depend on the load and the temperature of the battery. Check out the web for charge/discharge info.

A customer from Austin, Tx
Not all these are the same
This is called a "half-U1" case, which comes sized 17AH to 22AH, and it's the same case used by Robomower, batttlebots, and "jump starters", but that doesn't mean it's the same batt at all.

SLA comes in more or less 3 specializations:
General Purpose: cheap, meant to float for years and be cycled a few times at moderate currents (UPS batts, solar-charged stuff). If you run these down a lot at high currents, they will die in tens of cycles and will not run for very long each cycle anyways.
High Current batts: meant to be used for high currents like starting an engine, also often used for "personal mobility" scooters. The high current capabilities decay with repeated deep cycling.
Deep Cycle batts: built for "personal mobility" scooters, Robomowers, etc. They'll do fine at >10A discharges, and can withstand heat and vibration of being on such a device. Specs are often for >300 cycles, but really 200 is realistic for less ideal field conditions.

These are almost certainly GP batts (like 90% of what's sold). The high current and DeepC types are expensive specialty items and there are really only a few mfgs carrying good ones. I can't even find a website for Douglas Guardian, much less a spec sheet, so it's clearly a low-end GP.

Danny M

A customer from Southern California USA
13.7 - VDC Charging Voltage
The maximum charging voltage I've seen (and I've done a lot of electical work with autos) is 13.7 Volts DC. This charging voltage will not harm this 12V battery. In fact this battery would probably work fine as a starting source for a motorcycle. My 1000cc sportbike requires a 12V battery with a 12-14 Ampere Hour capacity. The battery listed above has an 18 ampere hour (AH) capacity, therefore it should have no problem being used in that application provided the starter circuit IS FUSED - as are most modern motorcycle electrical circuits.

A customer from Michigan
Great item!
I bought this thing as a replacement for an electric scooter, and it fit perfectly.Holds a relly good charge too! An original replacement for the scooter was over$99, and $40 for shipping.This is a much better option