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USAGE

Note alignment when inserting battery 

Never force battery pack into UNIT

For Cox Box:  Charge the battery until FULL is shown on the screen.

For Megaphone:  Charge in charger until solid green LED is shown.

CHARGING

I N S TA L L I N G   T H E   B AT T E RY   PA C K

NOTE

 the alignment guides on the battery pack - two on one end, one on 

the other.

"CLICK"

COX BOX / BLUE OCEAN BATTERY INFORMATION

SPECS

*As with any rechargable battery, NK Battery packs can be expected to lose 
approximately 

10-20%

 capacity per year.

Voltage (new)

12.6 volts

Weight

105grams/3.7 oz

Size

2.8 x 1.8 x 1.5 in

Operating Temp

-10 to 50°C

Storage Temp

-20 to 45°C

Charging Temp

0 to 45°C

For Cox Box:

  Battery will typically last 4-6 

(typical use is ½ volume and ½ talk time).

For Megaphone:

  Battery will typically last 8 hours 

(typical use is speaking 35% of time at volume level 6).

BEST PRACTICES

A fully drained battery requires at least 

6-8

 hours to reach full capacity,

Place your battery on charge whenever not in use, but avoid leaving it 
plugged in for more than three days at a time.

From 

0-90%, 

 the charge rate will be around 

0.5% 

of charge a minute. 

After it reaches 

90%, 

the charge is reduced and it will take longer to 

get to 

100%. 

Charging indicators:

 

Flashing Red - Charging 1 to 10%

 

Flashing Yellow - Charging 11 to 25%

 

Flashing Green - Charging 26 - 99%

 

Solid Green - Fully Charged, 100%

 

Flashing Red/Yellow/Green - See Errors section

For Cox Box Charging:

For Standalone Charger:

 

»

Batteries made prior to 

2015 

 with low capacity can be helped by 

rebalancing.

1.  Drain battery completely 

2.  Set aside for 

2 days

3.  After 2 days, charge unit until 

full

.

 

»

Batteries after 2015 will “self-balance” but it is best to occasionally 

fully drain and fully charge these batteries (without 2 day waiting 
period) to have this happen.

 

»

Check the “spring pins” in the charger or Cox Box battery cavity to 

ensure none are stuck in the down position.  If a pin is down, use 
alcohol to try and work it in and out to set back to proper height.

 

»

Dry off battery and charger before charging. Never charge a wet 

battery.

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