And then, when I put these identical cells in a ‘dumb’ charger , they perform very well again. Yes for a bears trimmer they might be fantastic, I use them in my final a very long time. You can recharge them.at any time you don’t have await them to be fully drained so when the facility starts to go down you’ll be able to just recharge them. The ones in my trimmer I normally prime off once a month. Personally I’d fairly readily accept a quarter much less lifetime of the battery if it means I only need to recharge it a 3rd as typically.