Amazon Basics 4-Pack Rechargeable 9 Volt Ni-MH Batteries, 200 mAh, Pre-Charged, Long Lasting Power, Recharge up to 1000x Times

I bought them for church for our guitar and bass. So far its been holding its charge and been recharging well. Price is reasonable.

These are very good quality 9V NiMH cells when compared to one of the pioneers, Tenergy 9V NiMH LSD, analyzed new out of box. Pros Came fully charged, using a battery analyzer all cells exceeded 180 mAh each Manufacture date is stamped on each battery, mine are Jul 2019. This reinforces they are fresh as aging deteriorates the pack ISO protocol battery analysis of 100mA discharge confirms that each pack stores >= 200mAh, actual was over 10% each. Each pack was within 5% of each other, very close tolerance Good build quality, excellent label on the cells, marking, and connectors By contrast, new 9v LSD NiMH I bought from another maker 10 years ago had none of these Pros except the last. Those packs suggest inconsistent manufacture, and only half of that batch of 9V work like new. Cons Slightly bigger than standard 9V and could be a tight or a no fit for some devices No data on self discharge rate, or expected calendar life Please note all types of 9V are actually battery packs, not individual batteries and should be treated as a NiMH battery pack, that is NiMh cells in series, otherwise you won't get the expected life in years of the pack. A pack should be kept fully charged, as the discharge rate of AmazonBasic 9V LSD are not known, its best to recharge these once a year, even if unused. Used packs should be charged up as soon as possible, if left in the discharged state it increases the risk of reverse discharge to some cells in series. This is because all cells have a self discharge rate, albeit small, but when in series, the weaker cells in series may be pushed into reverse discharge, and hence, over discharged. Also when a 9V is fully discharged, it usually means its at 7V, or about 1V per cell, the low limit before it is over discharged and some cells in the series may not be well made and may already be near or at reverse discharge. If you keep the pack topped up, it almost certainly will not happen. See comments for references.

Perfect for 9V pocket AM/FM radio, does not interfere with signal. 9V Stud Finder. Works on 9V devices, no more disposable batteries.

Nice product I am pleased with this purchase. June 2026

Works great for my needs

Works as they should, decent pricing

Great alternative to 9volt non rechargeable batteries! They take and hold a charge just fine and have high capacity. Just be sure to use a compatible charger for nickel metal hydride batteries.

great backups for 9 vdc equipment.

It is hard to find decent 9v rechargeable batteries. Happy with purchase

Great batteries

Passen gut zu den Feuermelder, langlebig

Bien que " Basics ", je peux affirmer que ce matériel est très satisfaisant.

Efter att ha kört laddning/urladdning 4 gånger håller de vad de lovar.