Alright if kept in original configuration, I have an alkaline one that I charge with my photovoltaic cells via it's soldered on connections. Alkaline batteries can sometimes leak a substance called potassium hydroxide which is a caustic agent that can cause eye, skin and respiratory irritations. This risk is reduced by not mixing different manufacturer battery types, batteries of different chemistries and by the replacement of all batteries at the same time. Alkaline batteries can be used for a wide range of applications. This RS Pro 4.5V non standard size alkaline battery is designed to be used with:-

The flat casing of the MN1203 contains multiple alkaline cells which together offer a higher capacity than the batteries fitted to more common household torches. This make them perfect for the compatible, high drain equipment they are designed for.

PX21 / 523 4.5V alkaline batteries equivalent to A133 EN133A PC133A V21PX RPX21 A21PX EPX21 3LR50 1306AP. * This is Duracell’s version of the 3LR12, MN1203 battery. It is also frequently referred to as a lantern battery, with it mainly being used in specialist flashlights and lanterns.

This M1203 will directly replace batteries with the following codes: 3LR12, MN1203, 1203, 1289, AD28, 3R25, AD28VP, 1289, 3R12G, 3R12R, H1176. alkaline primary battery from RS Pro. This non-standard size battery is designed for reliability in specialist applications such as lighting. This heavy duty battery has a high capacity and with the 4.5 nominal voltage, the battery is designed to last for much longer periods of time. You can be assured that this battery will give you the power you need even in the darkest of situations. This RS Pro alkaline battery is made with durable materials and the ability for a long shelf life completed with positive and negative spring terminal tags.