On Order Li-socl2 Er18505 Li-SOCl2 Battery fits Li-socl2 Er18505 3.6V, 4000mAh CS-ER18505 $25.29 The batteries we supply almost always will match the existing batteries capacity. Sometimes there may be a difference due to the availability of components. If you have the battery model number this is probably the most sure fire way to identify the correct replacement battery for your device. Some batteries can easily be identified from just the model... Add to cart