Hand a dock buddy a Group 24 case and ask them to guess the weight. When they brace for a hernia and get a shrug-lift instead, you have met the Solid State Marine 12V 90Ah – about 14 lb, white ABS armor, and a sticker that reads 90Ah like it means it. Brand price: $1,249.00.
The Short framing is the useful part of the pitch: this pack rates 90Ah and markets essentially all of it as usable, versus AGM where you politely leave half alone and commodity LFP packs that often leave usable capacity south of the number on the box. Specs from the shop page: Group 24 footprint about 10.6 x 7 x 8.35 inches, IP67, 90A continuous / 180A peak for 10 seconds, expand up to 4 parallel / 2 series, charge/discharge window roughly -4F to 155F, and Bluetooth monitoring baked in. Warranty talk: 8 years manufacturer defects / 5 years free replacement. Built and shipped from the New England shop floor (RI / MA mentions on the site).
The carry strap is not a fashion accessory – once the case is bolted in, that loop is how you extract a 14-pound brick without playing Jenga with the bilge. Same family design shows up across their lineup; on a trailer tongue it still looks like someone finally designed a marine battery that does not punish your lower back.
Fair caveats before you renumber the boat: charge voltage is 16.8V CC/CV, so your existing AGM/LFP charger may need a compatible profile or a different brick. “Solid state” is the brand’s claim (solid electrolyte story); forum skeptics sometimes read similar chemistries as semi-solid marketing – treat the label as interesting, then judge by weight, usable Ah, and thermal window. And yes, $1,249 is premium versus commodity 100Ah LFP that lives on price charts. You are paying for the density/weight party trick plus USA build and the long warranty copy.
Phone side: search SSM BATTERY MONITOR HP on iOS or Android, pair over Bluetooth, and watch SoC / volts without crawling into the battery box. Optional Victron / NMEA / CAN / RS-485 add-ons exist if your boat already speaks those dialects (they bump the price).
Get the Solid State Marine 12V 90Ah ($1,249.00) when Group 24 size should feel like Group 24 weight took a vacation.
Sources: Solid State Marine product page | 12V Battery Manual (PDF) | GadgetKing YouTube Short.