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The Weize 12V 100Ah TM is a Group 31 lithium iron phosphate deep-cycle battery with a built-in smart BMS. It is rated for more than 2000 cycles at full discharge and about 8000 at 50%, several times the life of a lead-acid battery of the same size. It weighs about 26.4 lb, so it is lighter than a comparable lead-acid deep-cycle and can be mounted in more positions. It suits trolling motors, RVs, solar and off-grid setups where long cycle life and low weight matter more than a low upfront cost.
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Lowest price we've seen: $138.98 on Nov 13 at Amazon. Tracked across 1 store since Nov 13.
Rated 4.9 out of 5 across 752 ratings, owners largely report the battery works as advertised in trolling motor, RV and solar setups. Most praise centers on runtime and the built-in protection; a few note charging quirks in cold weather.
This is a 12V 100Ah lithium iron phosphate (LiFePO4) deep cycle battery in the Group 31 size. It has a built-in smart battery management system (BMS). It is intended for energy storage in uses such as trolling motors, RVs, solar systems, marine setups, vans and off-grid systems. It also suits fish finders, ice fishing, camping, home alarm systems and e-scooters.
The battery is rated for more than 2000 cycles at 100% depth of discharge, or 8000 cycles at 50% depth of discharge (suggested). Lithium provides greater energy density than lead-acid and is at least half the mass. The battery has no acid, so it can be mounted in any position. It is not prone to thermal runaway and will not overheat or catch fire even if punctured.
The BMS protects against overcharge, over-discharge, over-current, short circuit, and low and high temperatures. If the voltage drops below 1V, the BMS cuts off the battery. Once the circuit is cut off, the battery reactivates automatically after 1 second, with no higher voltage input needed. Charging cuts off when the temperature is below 32°F. Charge it with a dedicated lithium battery charger, and connect no more than 4 batteries in series or parallel. Do not use it as a car, starting or golf cart battery.
