These lithium-ion batteries are made in the form of a classic 9-volt crown battery. The lot contains two batteries with a declared capacity of 650 mAh, the actual one is about 550-570 mAh. The voltage declared is 9 V, the real one is about 8.4 V - 8.5 V. The batteries provide protection against deep discharge (5.5 V). The weight of one battery is 28 g.
It should be noted that complete with batteries is a proprietary charger with two elements. It is designed so that when the batteries are placed in it, it is simply impossible to reverse the polarity. The charger is equipped with a two-channel battery indicator: green indicates a full charge, red indicates the charging process is active, alternating colors - the battery is faulty. The device automatically shuts off when the charge process is complete. The length of the power cable is about 400 mm. In the event of a breakdown, you can purchase a similar here.
Dimensions (L x W x H):
• battery: 47.8 mm x 26 mm x 16.6 mm;
• Charger: 90 mm x 60.7 mm x 25 mm.
The kit is delivered in a company box containing all the necessary information in English.
A similar option, but with a reduced capacity (actually about 300 mAh), an output voltage of about 9.1 V, a four-level battery indicator and the ability to recharge from a cable with micro USB can be purchased here. Note that such a battery due to the presence of the converter will cause interference, so it is not recommended to use it in a sensitive technique.
Such rechargeable batteries will definitely come in handy for those who constantly use devices powered by "crown" batteries. These batteries will not cause interference, so that they can be safely used in sensitive technology, such as microphones or electric guitars.
Cost: ~ 1530