The bar has been raised yet again. Roamer were the original designers of the Seatbase battery design and while many have copied the format since then, the 4th generation Roamer 230SEATBASE4 is the best iteration yet. Grade A+ matched cells provide 230Ah of usable capacity while a high power Battery Management System (BMS) with Active Balancing allows up to 3600W of continuous power - all in a custom case that fits neatly under a campervan swivel seat.