Out of 10 charging attempts, only 4 were charged. To give them a reason to doubt, I pulled out 6 uncharged ones and put 4 of them in lamps, which 4 charged. Nada. (I didn't bother with the rest of the package.) They didn't burn long. I let them charge for a week under the scorching Kentucky sun (and replaced the solar lights when the batteries didn't charge to make sure my gauges were fine). It is better to buy a better battery.
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