JMBatteries 48V 100Ah Sodium Ion Battery vs JM Batteries 51.2V 100Ah Sodium-Ion Battery

These are the same JMBatteries pack (model JM-W-48V100AH, 4.8 kWh, 10-year warranty) sold under two listings, so build and cells are identical. The real difference is the label and the spec sheet: A is pitched as a stackable, movable 48V pack for boats, carts, scooters and power systems, while B is pitched as a 51.2V solar storage pack and spells out the BMS numbers (100A charge, 150A discharge, 58.4V charge voltage, 44.8V discharge cutoff). Buy B if you want the documented electrical limits for a solar or inverter install; buy A if you want the stackable form factor and the wider list of vehicle and mobility uses. Sodium-ion is the shared trade-off: it is safer and cold-tolerant and avoids lithium, but it is heavier and less energy-dense than lithium, and these are niche packs with little independent owner feedback.

• Choose the 48V 100AH stackable sodium-ion pack if you need a movable, stackable bank for a golf cart, RV, boat or backup power system and want the listing that names those uses.
• Choose the 51.2V 100Ah sodium-ion pack if you are building home solar storage and want the charge and discharge current limits and voltages stated up front for sizing your inverter and charger.