Hi. I was wondering if someone could help with this question. I have a remote control mono wing foam glider that uses 4 x AA NiMh rechargeable batteries. The are not removeable as they are glued in the middle of the glider. Currently they are connected in series to produce around 5V and I can only charge them is series (not ideal).
As 1 or 2 of the cells are now on their way out, I'd like to build a small circuit so that I can balance charge them individually. To do this I first thought of inserting a switch between cell 1 & 2 (pos/neg), then another between 2&3 and also one between 3&4. However this is too manual when charging. I then thought of using a CD4066 as it's a quad bilateral switch. What I'd like to do is, when I power the glider up via a switch, this also powers the 4066, which in turn connects the 3 sets of Vcc/Vdd of the 4 batteries so the glider works. When I switch off the power, the connection drops so I can charge the batteries independantly. However, there seems to be quite a bit of resistance in the 4066. Can someone explain/make a better suggestion.
As 1 or 2 of the cells are now on their way out, I'd like to build a small circuit so that I can balance charge them individually. To do this I first thought of inserting a switch between cell 1 & 2 (pos/neg), then another between 2&3 and also one between 3&4. However this is too manual when charging. I then thought of using a CD4066 as it's a quad bilateral switch. What I'd like to do is, when I power the glider up via a switch, this also powers the 4066, which in turn connects the 3 sets of Vcc/Vdd of the 4 batteries so the glider works. When I switch off the power, the connection drops so I can charge the batteries independantly. However, there seems to be quite a bit of resistance in the 4066. Can someone explain/make a better suggestion.