：Rechargeable led bulbs on the desk lamp is a few volts?
Voltage can be determined. You can also to baidu search, the introduction of this respect or many. I wish you well.
Galvanic battery 4.47 V, the brightness of the light brighter than 4.2 V now, are you? You can try the 5 v charger, should be able to increase brightness. Brightness increased, however, is to rely on the voltage, made for light-emitting tube, will reduce the service life. This is the price.
General single LED lamp bead voltage range is 3.0-3.5 V. Your lamps of lead-acid battery rated voltage is how many? (you can have a look at a few hole, every hole is 2 v, if it is 3 hole, so the voltage should be 6 v.
