Sealed lead-acid still wins in the cold · review
A UL-recognized 12 V 100 Ah Group 30H AGM battery from a US company, mountable upside down, at 60 lb and $197.15. Mind its mixed-up wiring advice.
Universal Power Group’s UB121000 is a 12 V 100 Ah sealed AGM battery in a Group 30H case. UPG stresses that it is a US-based company with US support, and that the battery is UL recognized. It can be mounted in any orientation, including upside down, and is rated for float, cyclic and everyday use.
One bullet says the battery can be wired in parallel to create 24, 36, 48 and 60 V banks, or in series to create 200, 300 and 400 Ah banks. That is backwards. Series connection adds voltages; parallel connection adds capacity. Follow the physics, not the bullet.
No discharge current, no temperature range and no cycle figure. Renogy publishes all three for a battery of similar size.
12.17 × 6.61 × 9.16 in and 60 lb.
Ace Comp Solutions listed it at $197.15 on November 2, 2026, with a one-year warranty.
Prices quoted in this text were read on November 2, 2026. The live price is at the top of the page.
| Capacity | 12 V, 100 Ah |
|---|---|
| Chemistry | Sealed lead-acid, AGM, valve regulated |
| Size | Group 30H, 12.17 × 6.61 × 9.16 in |
| Certification | UL listed / UL recognized |
| Mounting | Any orientation, including upside down |
| Use | Float, cyclic and everyday applications |
| Weight | 60 lb |
| Warranty | 1 year |
| Amazon reference | B00S1RT58C |
Wire two batteries in series: the voltages add. The listing says “parallel” for this, which is wrong. Parallel wiring keeps 12 V and adds amp-hours.
Yes. UPG says it is engineered for float, cyclic and everyday use, which suits a UPS or an alarm backup.
60 lb, at 12.17 × 6.61 × 9.16 in.
8.0/ 10
A solid, UL-recognized Group 30H AGM battery from a US company. Ignore its wiring bullet, which has series and parallel the wrong way round.
Same category, nearby prices, between portable power units. What remains is the specifications every one publishes — half empty, a column is no use.
| Model | Price | Capacity | Chemistry | Size | Weight |
|---|---|---|---|---|---|
| UPG UB121000 Group 30H | $197 | 12 V, 100 Ah | Sealed lead-acid, AGM, valve regulated | Group 30H, 12.17 × 6.61 × 9.16 in | 60 lb |
| Renogy 12 V 100 Ah AGM | $209 | 12 V, 100 Ah | Sealed lead-acid, AGM | 13.1 × 6.9 × 8.6 in | 63.9 lb |
| UPLUS LDC12-100M Group 27 | $171 | 12 V, 100 Ah (10-hour rate) | Lead-carbon AGM with gel electrolyte | Group 27, 12.05 × 6.61 × 8.19 in | 60 lb |
| Mighty Max ML100-12 Group 27 | $170 | 12 V, 100 Ah | Sealed lead-acid, AGM, valve regulated | 12.09 × 6.65 × 8.48 in; Group 27 per the bullets | Listed as 28 lb |
Backup and solar banks where a known US brand and support matter
Specifications: the manufacturer sheet for portable power gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
12 V 100 Ah sealed lead-acid AGM battery, Group 27 per the listing, UL certified, 12.09 × 6.65 × 8.48 in, mounts in any position, battery and screws only, 1-year warranty
A UL-certified 12 V 100 Ah sealed AGM battery that mounts in any position, sold by Amazon at $169.99, the cheapest lead-acid option here.
Best for: Solar and backup banks where price matters more than weight or warranty
≈ $170
12 V 100 Ah sealed AGM deep-cycle battery, 13.1 × 6.9 × 8.6 in, 63.9 lb, 1,100 A (5 s) maximum discharge, discharge from -4 to 140 °F, under 3% monthly self-discharge, unlimited series and up to 4P parallel, 2-year prorated warranty
A 12 V 100 Ah AGM deep-cycle battery that discharges from -4 to 140 °F, with a 1,100 A five-second peak and low self-discharge, sold by Amazon at $208.99.
Best for: Cold-climate RVs and cabins, and anyone who wants a sealed battery without a BMS
≈ $209
12 V 100 Ah lead-carbon AGM / gel hybrid deep-cycle battery, Group 27 (12.05 × 6.61 × 8.19 in), 80% recommended depth of discharge, 25 A maximum charge (full in 5 hours), 45 A continuous, 710 A (5 s), 60 lb, 2-year warranty
A 12 V 100 Ah lead-carbon AGM battery rated for 80% depth of discharge, with charging and discharge limits in amps, at 60 lb and $171.46.
Best for: Solar and RV banks where you want lead-acid but need to use most of the capacity
≈ $171
