The HoserCam receiver battery specs are:

12 volts, 1.2 amp hour Valve Regulated Sealed Lead Acid.

Compatible models are:


Yuasa model NP1.2-12FR
Power-Sonic model PS1212
Panasonic model LCR-12V1.3P

Replacement batteries are available online at

www.houseofbatteries.com 1-800-432-3385,

www.powersonic.com 1-877-746-2288,

www.batteriesamerica.com 1-800-308-4805


Battery Maintenance

CAUTION:

Always wear safety glasses and charge in a well ventilated area. If the battery becomes really warm to the touch, discontinue charging and allow the battery to cool. No sparks, flames or smoking while charging.

Remember for best battery life, leave the receiver battery unplugged from the receiver during storage.

It is important to measure the battery voltage one (1) hour after charging with the battery disconnected from the charger. While charging the battery voltage will rise to the charging voltage of the battery charger, then will slowly drop back to itís true charge voltage after being disconnected from the battery charger.

Using a DC voltmeter or multimeter, a fully charged sealed Valve Regulated Sealed Lead Acid battery should measure 12.6 volts fully charged. Self discharge rate is very low, roughly 5% per month at 75 degrees F. So once fully charged a battery should stay charged until used.

After use, charge the battery before storing the HoserCam. Storing a partially discharged battery will reduce battery life, plus if you forget to charge the battery before use, you can count on it running down during the best run on the best stage of the next match!

Measure the battery voltage before charging. If the battery voltage is:

12.6 volts or higher no charging is required

12.0 to 12.6 volts charge for 3 to 8 hours

11.0 to 11.9 volts charge for 10 to 15 hours

below 11.0 volts may require special charging. The battery may need a higher
voltage to overcome the initial internal resistance. So try charging the battery for 10 minutes with just the AC adapter without the charger adapter. Then plug in the charger adapter and charge the battery for 15 hours.

In all cases after charging remove the charger and let the battery sit for one (1) hour before measuring the voltage

The way the charger works is like this. The receiver AC adapter unit converts 110 Volt AC to about 18 volts DC. This voltage is too high to charge the receiver battery for any length of time untended. When charged at too high a voltage the water in the battery acid boils off and is vented to the outside. Since this is a sealed battery itís not feasible to add water. So a regulated charger is required. The charger consists of an adjustable voltage regulator set to limit charge voltage to 14.1 volts. The charger also is designed to taper charge the battery. As the battery reaches full charge the current limit design tapers off the amount of current going to the battery. Typically it starts out at about 300 mah or .3 amps and as the battery charges the battery impedance or resistance increases and that reduces the amount of current going to the battery. When the battery is fully charged only about 8 mah or .008 amps of current is going to the battery. As the battery is charged the voltage starts out at say 11.64 and the current at 300 milliamps. The voltage slowly rises to about 14.10 volts as the current drops to 8 milliamps.

copyright 2003 Nolan Smyth