Built-in charge and discharge power MOS;The existing power management chip on the market all are HOTCHIP HT4928S which the parameters is same as134N3P

Charge status indication. Red light flashes when charging; Long red light when full

The step up charging board can be connected to a lithium battery and connected in multiple sections of lithium batteries, as long as the voltage is 3.7-4.2V in parallel(only be connected in parallel, not in series)

Available for various batteries like Polymer ,18650 Lithium ,Cell Phone ,Tablet and MP3 Battery

it has protection functions, protect from over-charger / over-discharger/ over-load ( support charger and discharger at the same time )