to get a maximum mah rating battery look for a battery bank that has highest wh ratings.
an individual cell having WH rating above 9.5 means it at least is 2500mAH.
now to get capacity of each cell look at below text of mine which i wanted to post at other thread but found this one relevant.
i got a way to calculate the exact theoratical capcity of the cell by just looking at the battery pack.
only three things are required and all are readily available.
1: Voltage of battery (most will be 11.1 or 10.8 v ) . this is written on battery.
2: Total Capacity (either in mAH or WH ) .. we need to do all calculations in Wh. if its given in mah then multiply the capacity in mah by the voltage of the pack.
3: Number of Cells -- one can judege them from the size of battery. (most will be 6,9,12 cell batteries)
Here is the its implementation
Dell PC765 11.1V 5200Mah LG LGDB118650 2600Mah Post Downlinx
total capacity in watt hour : 11.1 x 5.2 (remove the mili part by moving decimal over three points) = 57.72 WH
now since all cells are of equal charestristics so from battery appearance we can say its 6 cells so total capacity of each cell in watt hour (Wh) is 57.72/6 = 9.62 Wh
now to convert form wh to mah we divide the capacity in wh by voltage of that cell. Liion voltage are in 3.4-3.8 ranges. mostly .. so if its 6 cell battery and total voltage is 11.1 then we can say its 3 series and 2 parallel. we are concerned with series cells. so to get voltage of each cell divide total voltage of battery by 3 in above case 11.1/3=3.7
now we got voltage of individual cell so going back to our calculations .. we got capacity of each cell in wh ,, for mah divide wh/volts
9.62wh/3.7 volts = 2.6 Ah.
Second Example:
Fujitsu FMVNBP135 7.2V 5200Mah Sanyo Light Blue 2600Mah Post ChibiM
wh=7.2 x 5.2 =37.44
total cells assume 4
37.744 /4 = 9.36 Wh of each cell.
since 2 cells seems to be in parrallel to give 7.2 volts . so 7.2/2= 3.6
so mah of each cell
9.36/3.6 =2.6 Wh
Example 3:
Toshiba PA3382U-1BAS 14.8V 6450mAh Sony US18650GR 2150Mah Post Suncoaster
14.8 x 6.45 = 95.46 wh
seems 12 cell battery (4 series 3 parallel ) from look so 14.8/4= 3.7 volts to each cell
wh of each cell 95.46/12=7.95 wh of each cell
7.95wh/3.7v=2.15 AH
i hope somone good at andorid programing would code a little utility for this purpose ... dang i never worked with visual programing. all were console based.