This battery has plenty of power and operates for more than an hour without the power gradually "tapering down" as it discharges.
It fully recharges in about 2.5 hours. For these reasons and for string-trimmer use, I'd recommend a lithium battery, such as this, over the nickel-cad rechargeable batteries, which, in my experience, have had shorter use times while the power steadily tapered off as they discharged.
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