Customer Comments
Average Customer Review:
(13 Reviews)
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 Ohio
Type?
Is this AGM? Deep cycle? How can I tell?
A customer from Nashville, TN
Max Current Drain
This is EXACTLY the battery used in the popular jumper start packs which are sold widely. And, it does work for starting your car when the battery is run down. I've never seen one do it, but I suppose it is possiblr to explode one.
A customer from CA
Motorcycle battery?
Say, I wonder if one of these would work in my motorcycle- looks to be about the same dimensions and is actually larger in capacity. Just not sure if it could handle the cranking amps- probably around 30-40 I reckon. Also, would running at around 14.5 V continously do any damage? Can't seem to find complete specs on the battery. It would be cheaper than an AGM type, but not the regular wet cell. Editors Note: THIS IS NOT A MOTORCYCLE BATTERY. Will not handle the 30 to 40 amps and 14 volts will overcharge the battery causing it to explode.
A customer from Los Angeles, CA
A couple notes
This is essentially the same SLA battery used in FIRST robotics competitions-- same specs, form factor and all.
Amp-Hours are an approximation of a battery's capacity. it's amps times hours= 18, so plug in what you know and solve for what you don't. This doesn't hold true for high current drains, as the more current you drain from the battery the less efficient it is and the less its capacity appears to be.
YOU CANNOT test a battery's internal resistance with a multimeter on "resistance" mode. Doing that will either give you a nonsense reading or destroy your multimeter, depending on its quality. Similarly, you cannot test a battery's peak current by setting it to Amps and connecting it across the battery leads directly. That's just a short circuit and depending on the quality of your meter you'll either blow a fuse, vent magic blue smoke, or be scalded by molten copper shunting that burns its way through the plastic of your meter.
-Ethan
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