There are 4 battery charge packs. One has a solar panel for recharging (it takes a long time to fully recharge with the solar panel, much faster to recharge by plugging it in) and a flashlight built in. It is rated at 15,000mHa but that seems a bit high for it honestly. It does work well though. The 2 Monster packs are rated at 3350mHa. They both work well. The I-Go pack is rated at 1800mHa. Everything works. $10 for all of them.