Echometer Company
Model – M Manual
Phone: (940) 767-4334
5001 Ditto Lane
Page
23
Fax: (940) 723-7507
Wichita Falls, Texas 76302, U.S.A.
E-Mail:Important Notes and Instructions for Rechargeable Batteries
The battery is rated at 2.5 Amp-Hour. The Model M current drain with the chart drive on is 1 Amp. Thus the battery
operating ON-time is approximately 2.5 hours and the unit would use about five rolls of paper.
1 - Charge battery before using. Use ONLY the CHARGER that is provided with the Echometer Model - M.
2 - When not in use for extended periods of time, remove battery from the instrument and store in a cool dry place or
leave the AC charger connected continuously.
3 - Do not short-circuit the battery terminals.
4 - Keep away from fire and do not incinerate when disposing of battery ... it may explode.
5 - Under no circumstance should you attempt to open the battery case.
6 - Do not expose battery to moisture or rain.
7 - Do not drop, hit or abuse the battery, because it will break and may release electrolyte as well as expose cell
contents, which are corrosive.
8 - It is perfectly normal for the battery to become warm to the touch during charging and discharging.
9 - Running time depends on the power demand and the operating temperature.
10 - The life of the battery under normal conditions may be as long as 1000 charge-discharge cycles.
11 - New batteries may require four or five charge-discharge cycles before achieving their designated capacities.
12 - Sealed lead-acid batteries may be stored as long as 12 to 18 months in a cool dry place. They should be recharged
every 6 months.
13 - Always fully charge the battery before using it after it has been stored for over one week.