Ok. Most of you guys know that my DJ-Tech Boombox's internal circuitry isn't charging my battery fully (12.4V). This is resulting in less play time and the battery status indicator on the box always being one light down from the start. I am still able to get a few hours of play time using the internal charger but if it was charging properly I could get 10hrs +
What I wish to do is bypass the internal charging circuitry by tapping directly onto the battery terminals inside the box to a female barrel plug adaptor mounted externally on the box. Then using a male barrel plug, supply charging current directly to the battery. I'm smart enough to get polarity correct and maybe use a diode in the circuit (for reverse polarity safety) and a 5A inline fuse just in case of a short.
I see all kinds of SLA battery chargers on eBay. They are advertised as 12V SLA battery chargers. I want to stick with a charging circuit of around 600mA but no more than 1300mA. My problem with these chargers is the output voltage. They all say 12V. My battery already gets up to 12.4V (not fully charged) and shows partially discharged on my meter of my box. I need at least 12.6 to 12.7 resting volt before the battery status indicator shows full.
My questions are:
1: Don't the chargers need to be at least 14V to get the battery topped off with a resting voltage of 12.7 to 13.29? Otherwise my meter will just show partially discharged as it is looking at voltage.
2: Do I need to continuously monitor the charging process manually doing it this way or will the output of the charger and the battery equalize when the battery meets the chargers output voltage? I don't want to overcharge.
3: Is this a bad idea?
What I wish to do is bypass the internal charging circuitry by tapping directly onto the battery terminals inside the box to a female barrel plug adaptor mounted externally on the box. Then using a male barrel plug, supply charging current directly to the battery. I'm smart enough to get polarity correct and maybe use a diode in the circuit (for reverse polarity safety) and a 5A inline fuse just in case of a short.
I see all kinds of SLA battery chargers on eBay. They are advertised as 12V SLA battery chargers. I want to stick with a charging circuit of around 600mA but no more than 1300mA. My problem with these chargers is the output voltage. They all say 12V. My battery already gets up to 12.4V (not fully charged) and shows partially discharged on my meter of my box. I need at least 12.6 to 12.7 resting volt before the battery status indicator shows full.
My questions are:
1: Don't the chargers need to be at least 14V to get the battery topped off with a resting voltage of 12.7 to 13.29? Otherwise my meter will just show partially discharged as it is looking at voltage.
2: Do I need to continuously monitor the charging process manually doing it this way or will the output of the charger and the battery equalize when the battery meets the chargers output voltage? I don't want to overcharge.
3: Is this a bad idea?