[Safer & Smarter ] ECO-Worthy Lithium battery has a built-in BMS, all-round protection provided by the advanced BMS, prevents from overcharge, overdischarge, overload, overheating and short circuit, and low self-discharge rate. In addition, it can be connected in parallel or in series to obtain greater capacity and voltage. Up to 4 identical batteries can be connected in series with a maximum of 48V. It is recommended that no more than 4 batteries be connected in parallel [10A Intelligent Digital Display & Intelligent Detection] It's not just a trickle charger, it's an advanced battery maintainer.When low voltage, vulcanization or loss of capacity is detected, the battery maintenance charger will directly prompt the user to repair and charge or the battery has lost value [Matching with most Battery Chargers] ECO-Worthy 12V 100Ah LiFePO4 battery can be charged efficiently by the 12V 10A LiFePO4 battery charger in about 10 hours. It can charge and maintain cars, motorcycles, lawn mowers, ATVs, lawn tractors, trucks, SUVs, boats, PWCs, classic cars, etc. ECO-WORTHY 12V 100Ah LiFePO4 Battery with 10A Smart Lithium Battery Charger, Built-in BMS, 3000+ Deep Cycles, for RV, Marine, Solar Off-Grid System, Household, Group 31 Batteries