The key chips soldered on the small PCB are 3YC9 (Dual Li-Ion protection), and 3V451K (Dual mosfet). In the image (borrowed from web) you can see two series-connected 1S LiPo cells with the protection circuit between. Look below to know the inside of a 9V rechargeable battery. So, you’ll get only 7.4VDC nominal output from the first model, whereas the latter will give 9VDC output (but not always – read following reports). The available 3.7VDC input is converted to 9VDC output by means of a built-in dc-dc boost converter circuitry, and there’s also an onboard charger circuitry to recharge the 1S cell from an external 5VDC/USB power supply. However, some other 9V rechargeable batteries have only one 1S (3.7V) Li-Ion or LiPo cell inside. Mostly, many manufacturers make 9V rechargeable batteries using lithium-ion or lithium-polymer cells, perhaps with a flake of electronics to provide enough under/over voltage protection. It’s quite natural and as expected – these rechargeable lithium-ion batteries have two 1S (3.7V) Lithium cells inside. Now you can see that the nominal output voltage is 7.4V, and the charging voltage is 8.4V.

Just to exemplify, I’m giving a snip from the datasheet of a rechargeable lithium-ion 9V battery: But wait – you can see many strange faces there in the crowd! On account of the tragedy, the rechargeable edition might look like a godsend. Personally, I am not a big fan of the common 6F22 9V battery as it needs frequent replacements, and the regular chore drains me of money. But don’t be lulled in by the magical description “Rechargeable Lithium-ion 9V battery”. The 9V rechargeable batteries can be found at local or on-line stores and if required, easily ordered. Certainly, a rechargeable 9V battery (if with a very low-self discharge rate) will be a good pick for use in stand-by applications. Nowadays, the term “Rechargeable 9V battery” simply represents a rechargeable Lithium-ion (or Lithium Polymer) battery which can (supposed to be) provide a bit more healthy 9V nominal output. However, there are other designs as well, for example, with rectangular cells.

Alkaline 9V batteries often contain six LR61 cells which are very similar with AAAA cells hence the IEC label 6LR61 (ANSI label 1604A). The non-rechargeable Lithium 9V batteries contain three 3V cells providing nominal 9V with cut-off voltage of 6V, just like Alkaline 9V batteries. Rechargeable 9V BatteryĩV batteries can be both non-rechargeable and rechargeable batteries, featuring different battery chemistries. So now I’d like to talk about something often overlooked by many. Instantly thereafter I got numerous requests to shed some light on the technical aspects of the rechargeable 9V editions – yes, it’s new to many people. Very recently I got an assortment of rechargeable 9V batteries from an overseas source, and then I made a post on that in my Facebook page. Then why this article? Yes, I have a good reason to share some thoughts here!

The clever design of the snap-style battery connector prevents casual wrong polarity insertions.įrankly, I don’t want to rewrite the golden history of 6F22 9V battery which is very familiar to almost all guys. The battery terminals are positioned on the same battery end: ‘+’ is male clasp, and ‘-‘ is female clasp. Also note that, according to ANSI standard, label for the carbon-zinc battery is 1604D. As you may know, physical dimensions of the 6F22 9V (carbon-zinc) battery is 48.5mm height, 26.5mm length and 17.5mm width.

This is a snip from the official product datasheet of the Eveready Silver 9V (6F22) battery. According to IEC label, 6F22 denotes carbon-zinc battery chemistry, and its nominal capacity is 400mAh. They can also be found in various devices at home that require slightly larger voltage from a single battery. The 6F22 9V battery is very popular rectangular battery quite often found in the drawer of an electronics hobbyist! Its most common names include 9V battery, 9-Volt battery, E battery, PP3 battery, 6F22 battery, MN1604 battery and similar.

9v lithium ion battery