The Custom Lithium Slim series provides high-capacity power in a slightly taller format than the Ultra Slim range, offering more flexibility where space is available.

This makes Slim batteries well-suited for camper trailers, canopies and vehicles where under-seat or low-profile Ultra Slim units may not fit. The Slim range includes 100Ah, 200Ah and 230Ah models, allowing users to choose a battery that matches their power needs.

Smaller capacities are ideal for running fridges, lights, or water pumps on short trips, while the larger 200Ah and 230Ah units can support longer tours or setups with multiple accessories. Compared with the Ultra Slim series, Slim batteries trade a slightly taller profile for a practical balance of capacity and installation versatility, making them easier to integrate into mid-sized compartments or modular setups.

These batteries use LiFePO₄ (lithium iron phosphate) cells, providing stable voltage, long cycle life, and consistent output. Each includes an integrated Battery Management System (BMS) to protect against overcharging, over-discharging, and overheating – features that are particularly important for off-road and remote use. For 4×4 drivers, campers, and overlanders, the Slim series provides reliable, consistent power for fridges, lights, water pumps, and other essential gear.

By offering a balance between size, capacity, and durability, the Slim range is a practical alternative to Ultra Slim batteries when a little extra space is available without compromising vehicle layout or payload.

More info at Custom Lithium