"12V 100Ah" is the most searched battery size in the industry and the least specific: the label fits a solar gel block, a deep-cycle storage block and a mixed-duty Gel AGM block that share a capacity and almost nothing else. XD Battery manufactures all three, and this page lines them up honestly — same voltage, same nominal capacity, different engineering briefs — so the choice is made on duty, not on the label.
| 12V 100Ah Deep Cycle Storage Battery (lead acid) | 31 kg · 407 × 172 × 240 mm · warranty 3 years · deep-cycling series — the daily-cycling workhorse |
|---|---|
| 12V 100Ah Solar Gel Battery | 31 kg · 407 × 172 × 240 mm · warranty 3 years · gel electrolyte — heat-tolerant, spill-proof solar duty |
| 12V 100Ah Gel AGM Battery | 29.5 kg · 407 × 174 × 215 mm · warranty 3 years · maintenance-free · widest documented application list (UPS, solar, telecom, data centre, traffic, aviation…) |
How to choose among them
Start with the discharge pattern. Daily deep cycling for a solar system points to the deep-cycle storage block, or to the solar gel model where the enclosure runs hot or the site is unmanned — gel’s tolerance for heat and deep discharge is its documented design intent. Standby and mixed duty — a UPS that also rides through regular outages, a telecom cabinet that cycles on bad-grid days — points to the Gel AGM model, whose documentation is written for exactly that breadth and whose slightly lower, lighter case suits retrofit cabinets. Price them all if the duty is genuinely ambiguous; the differences are real but none of the three is a wrong battery — they are answers to different questions.
One specification trap deserves naming: 100Ah is a rate-dependent figure. A block rated at the 20-hour rate and one rated at the 10-hour rate carry the same label and different real capacity at your load. When comparing our blocks against any other source, compare at the same rate — and when you inquire, tell us the load profile, because the right 100Ah for a 5-amp overnight drain is not the right 100Ah for a 60-amp inverter surge pattern.
How much usable energy is 100Ah at 12V?
Nameplate energy is about 1.2 kWh; at the customary 50% depth-of-discharge design point for lead acid, plan on roughly 0.6 kWh of daily usable energy per block.
Can I parallel four of these for a bigger bank?
Yes — identical model, identical age, ideally same batch. Beyond four parallel strings, step up in block size or voltage instead; balance suffers as parallel count grows.
Which is best for a boat’s house bank?
The gel model for unmanned, hot engine-room-adjacent service; the deep-cycle block for attended service. The marine page works through boat-specific sizing.
Rate honesty: read the 100Ah label correctly
All three blocks on this page wear the same "100Ah" label, and the label conceals a variable every buyer should expose: the discharge rate at which the capacity was measured. Capacity quoted at the 20-hour rate flatters the battery versus the same figure at the 10-hour rate, because lead acid delivers less total energy the faster it is drained. When a competing quote undercuts on an identical label, the rate basis is the first place to look — and the first question to ask. Our quotations state capacities against the models’ documented bases so the comparison can be made cleanly; insist on the same from any source.