How long charge 9v battery

Handling your 9V rechargeable battery inappropriately may not end well. You may even see the worst-case scenario— as inappropriate charging can kill your battery in as little as a few hours.

Exposing your battery to too high a charge voltage causes its premature aging. Excessive current flows into the battery, the water in the electrolyte decomposes and the battery heats up.

This is the process called thermal runaway and it can destroy your battery. Ideally, opt for quality chargers with an integrated microprocessor control unit. They are less likely to heat up and burn your hands.

Now, below is a breakdown of how to safely recharge a 9V battery with 8. Similarly, you can charge a 9V battery with a 12V charger, and we show it in more detail below with Lithium-ion and NiMH batteries. The 9V li-ion battery is made of two 3. To safely recharge it you need a voltage source of 8. To regulate your 12V source to 8. It will automatically stop the charging once each cell voltage reaches 4.

The battery consists of seven 1. A simple resistor R will be adequate to design a crude current source from your 12V source. It depends on the charger, the battery chemistry, and the battery brand. Yet, it will take you an average of 8 hours to charge a dead 9V rechargeable battery to its full capacity. Much depends on the battery chemistry. It also affects the three major quality attributes of rechargeable batteries:. Unlike Lithium ions where you can set a maximum charge voltage while charging, NiMHs are charged by forcing current through the battery.

I-Power 9V Li-Polymer Rechargeable Battery is ideal for use in high powered devices and has a wide application in the sound and audio niche. This battery pack is designed with safety and longevity in mind. The Build-in Protection IC system safeguards it from over-current and ensures maximum cycle life.

This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. By continuing to use this site, you are consenting to our use of cookies. Forums New posts Search forums. Articles New articles New comments Search articles. Classifieds New listings New comments Search listings.

Log in Register. Search only containers. Search titles only. Search Advanced search…. Anything renewable? That is interesting concept. If it produces 3. Let me know, I could calculate the numbers for this.

Vince, Do you mean 1 amp for 1. Awaiting your prompt action. I was hoping a website like this for charging times would exist. The information this page provides is extremely helpful to me as I have quite a large variety of different rechargeable type batteries to charge.

Also I find building my own specific chargers to be a lots of fun. I have been using LM etc. I never rush any charging time. Thank you very much for putting this web page together. It has to be the exact power BT 3. Thanks, Rose. Greetings, I have 2 lie on rechargeable batteries , mAh 3. My question is….. Will this charger fully charge the batteries to there full potential? They seem to be a high quality batteries. For the time being it could work. I have a Minelab Slimpack nimh rechargeable battery pack This calculator does not give a correct result.

I think this is because of a stray multiplier you introduced in one of the formulas you use. You state the theoretical formula for calculating the time it would take to charge given that charging commences without losses at a constant current :.

What does it represent? You can check your calculator by setting the capacity to mAh and the charger current to mA. This should give you 1 hr, but your calculations point at 1. It needs to go further. But do not confuse this 1. Even though the Ampere is actually a SI unit of current being transited per unit-time.

An average, instantaneous and constant current are expressed in Amperes e. Smart or trickle charger? Should you buy superfast? Do you really need a charge indicator? We asked hundreds of Which? Read the tips below to help choose the best for you — and avoid purchasing a dud. The most important factors to consider when buying a new battery charger:.

Based on a survey of 1, Which? When we surveyed Which? For more shopping tips, read our guide on how to buy the best rechargeable batteries.

This is because smaller cells could be overcharged and larger ones not fully charged in the same session, which can damage batteries over time. Batteries with different chemistries - such as nickel-metal hydride NiMH or Nickel Cadmium NiCad — shouldn't be recharged together either. Manufacturers often recommend that their batteries are charged best by the same brand's battery chargers. This is because they can adapt how the charger works to suit their batteries. Some battery chargers are claimed to be able to recharge disposable alkaline batteries.

We tested two the Deluxe Battery Wizard for alkaline and zinc-carbon batteries, and another battery charger for disposable alkaline batteries with Energizer alkaline batteries.