DC Rechargeable Battery is LEGO set 45501-1. It has a score of 76. This is average compared to all other sets. The set is recommended by 0 reviews, based on 2 scored reviews and 2 reviews total. It is ranked in the bottom 29.08% scored sets on Brick Insights. We know this set was released in 2013, and it is categorised in Education.
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Easier than replacing batteries. It fit perfect. It does protrude a little more than the standard batter compartment. Has already saved me and my children from having to break apart a couple of designs. I see long term value. And it lasts. Longer than any (even high drain digital device) batteries anyway.
No need to buy the expensive charger! I have successfully used both a 9 volt and a 12 volt power supply to recharge the battery. My research indicated that the battery pack contains an MP26123 monolithic DC-DC stepdown switching charger, so the exact voltage is not critical. Nine and twelve volt power bricks are very easy to find, and are also inexpensive. I wouldn't recommend going below 9 or above 12 volts.